chemical reactions and equations topic- chemical reactions

Chemical reactions and equations

TOPIC- CHEMICAL REACTIONS AND EQUATION, INTRODUCTION, REACTION &

BALANCING

1)Which of the following is not a physical change?

a) Boiling of water to give water vapour

b)Melting of ice to give water

c)Dissolution of salt in water

d)Combustion of liquified petroleum gas(LPG)

2)Which one of the following processes invlove chemical reactions ?

a)Storing of oxygen gas inder processes involve in a gas cylinder

b)Liquification of air

c)keeping petrol in a china dish in the open

d)heating copper wire in presence of air at high temperature

3)In which of the following chemical equations the abbrevations represent the correct states of the

reactants and products involved at reaction temperature ?

a) 2H2(l)+O2(l)-->2H2O(g)

b) 2H2(g)+O2(l)-->2H2O(l)

c) 2H2(g)+O2(g)-->2H2O(l)

d) 2H2(g)+O2(g)-->2H2O(g)

4)In the balance equation

a Fe2O3 + b H2 -----> c Fe + d H2O

The values of a, b, c and d are the respectively

a) 1 1 2 3

b) 1 1 1 1

c) 1 3 2 3

d) 1 2 2 3

5) When magnesium ribbon is burned in air the ash formed is

a)white

b)green

c)yellow

d)black

6)The formale of quick lime and limestone are respectively.

a)MgCO3 , Mg(OH)2

b)Ca(OH)2,CaCO3

c)CaO,CaCO3

d)CaCO3,CaO

7) The formula of rust is

a)FeO4

b)FeSO4.7H2O

c)FeCl3.XH2O

d)Fe2O3.XH2O

8)The values of a ,b ,c and d in the balanced chemical equaton :

a BaCl2 +b Al2(SO4)3---->c AlCl3 + d BaSO4are :

a)3 ,2, 2, 3

b)3 ,1 ,2 ,3

c)2 ,4 ,2 ,3

d) 3 ,1, 3, 2

9) Sodium and chlorine are reacted and as a result, sodium chloride is formed which is also called

table salt. What option gives the reactants and products of the reaction ?

a)reactant - sodium and table salt : product-chlorine

b)reactant - sodium : product-chlorine

c) reactant - table salt : product- sodium and chlorine

d)reactant - sodium and chlorine : product-sodium chloride

10)A Student performs an experiment to form aluminium chloride from aluminium and chlorine.

Which options give the chemical equation of reaction.

a)Al +Cl2 ----> AlCl2

b)2Al +Cl2 ----> 2AlCl2

c)2Al +3Cl2 ----> 2AlCl3

d)3Al +3Cl2 ----> 3AlCl23

11) A researcher adds a barium hydroxide to hydrochloric acid to form a white colored barium

chloride. Which option gives the balanced chemical equation of the reaction ?

a)HCl + Ba(OH)2 ----> BaCl2 + 2HOH

b)2HCl + Ba(OH)2 ----> BaCl2 + 2H2O

c)2HCl + Ba(OH)2 ----> BaCl2 + 2HCl+O2

d)HCl + 2Ba(OH)2 ----> BaCl2 + 2HOH+O2

12) The chemical formula of magnesium oxide is ?

a)MgO2

b)Mg2O

c)MgO

d)Mg(OH)2

13) The chemical formula of lead sulphate is

a)Pb2SO4

b)Pb(SO4)2

c)PbSO4

d)Pb2(SO4)3

14) Which information is not conveyed by a balanced chemical equation ?

a)Physical states of reactants and products

b) Symbols and formulae of all substances involved in a particular reaction

c) Number of atom molecules of the reactants and products formed

d)Whether a particular reaction is actually feasible or not.

______________________________________________________________________________

ANSWERS :

1.D

2.D

3.C

4.C

5.A

6.C

7.D

8.B

9.D

10.C

11.B

12.C

13.C

14.D

Combination Reactions

1) Which of the following reactions involves thecombination of two elements?

a) CaO +H2O → Ca(OH)2

b) NH3 + HCl→ 2NaOH

c) Na₂O+H2O → 2Al2O3

d) 4AI + 3O2 →2Al2O3

2] 2 NH3 + H₂S04 → (NH4)2SO4

Above reaction is

a) decomposition reaction

b) Combination reaction

c) Single displacement reaction

d) none of these

3) combination reactions are the examples of

a) displacement reaction

b) endothermic reaction

C) exothermic reaction

d) none of these

4) The reaction of H₂ gaswith oxygen gas to form water is an example of

a) redox reaction

b) combination reaction

c) double displacement reaction

d) All of these.

5) During combination reaction of an element‘X ’on exposure to moist air turns reddish brown and

a new compound ‘Y’ is formed. The substance ‘X’andÝ’are

a) X= cu. Y = CuO

b) X=Ag Y = Ag2S

c) X=Al Y = Al2O3

(d) X=Fe Y = Fe2O3

6) A combination reaction is one in which-

a) bond get formed in between reactants

b) bond get breaks in of the reactant

c) ions get exchangedin between reactants

d) None of these.

7) combination reactions are the examples ofexothermic reactions? Find acorrect reason for the

same

a) bond get breaks of the reactant

b) bond get formed in between reactants

c) both (a) and (b)

d) none of the above.

8) Water is added to the solid calcium oxide or quick lime taken in a beaker what do you feel when

you touch beaker point out correct option

a) beaker become cool

b)beaker become warm

c) No change in temperature

d)none og the above

9) which among the following changes to exothermic in nature ?

a) Decomposition of ferrous sulphate

b) Dissolution of sodium hydroxide in water

c) Dissolution of ammonium chloride in weter

d) Mixing of sand and sulphur

10] which among the following is (are) combination reaction(s)?

a)2KClO3Heat 2KCl + 3O2

b) 4 Al +3O2 2Al2O3

c)Na2SO4 + BaCl2 BaSO4 + 2 NaCl

d) 2Fe2O3 +n H2 O 2 Fe2O3.nH2O

a) (ii) and (iv)

b)(I) and (iii)

c) ii only

d) (iii) and (iv)

11) The reaction in which two reactants react to form single new compound is -

a)a displacement reaction

b) a decomposition reaction

c) a combination reaction

d)a double displacement reaction.

12) combination reactions are also called as

a) Endothermic reactions

b) Synthesis reactions

c)Oxidation reactions

d) Reduction reactions.

ASSERTION AND REASON

Each of these questions contains an Assertion (A)followed by Reason (R)Read them carefully and

answer the following question on the basis of following options.You have to select the one that best

describes thetwo statements.

a) BothA&R are the correct and Reason (R) isthe correct explanation of Assertion

b) Both A& R the correct, but Reason (R) isnot the correct explanation of Assertion (A).

C) A is correct and R is incorrect

D) A isincorrect and R is correct

1) Assertion (A): quicklime reacts vigorously with waterreleasinglarge amount of heat.

Reason (R): The above chemical reaction is an exothermic reaction

2)Assertion (A) : Coal burns in presence of oxygen

Reason (R) : The above chemical reaction isoxidation reaction

3) Assertion (A) : Carbon dioxide turns lime water milky

Reason (R): carbon dioxide sullies the water

4) Assertion (A) : Glucose combines with oxygen in the cells of body to provide energy

Reason (R) :The special name of the abovereaction is respiration.

5) Assertion (A): calcium carbonate when heatedgives calcium hydroxide and water

Reason (R) : Calcium hydroxide is used forwhite washing walls

Key Answers

1.D

2.B

3.C

4.B

5.D

6.A

7.B

8.B

9.B

10.A

11.C

12.B


1.A

2.B

3.C

4.A

5.D

Decomposition reactions

Q.1 The colour of ferrous sulphate crystals is

a] Red

b] Blues

c] Green

d] Violet

Q.2 The colour obtained after heating ferrous sulphate crystal will be

a] Green

b] Brown

c] Violet

d] White

Q.3 which of the following reactions can also be termed as thermal decomposition reaction?

a] combination reaction

b] decomposition reaction

c] Displacement reaction

d] Double displacement reaction

Q.4 The chemical formula of Lead nitrate is?

a] PbNO3

b] Pb(NO3)2

c] PbO

d] Pb3N2

Q.5 Which of the reactions is used in black and white photography?


c] decomposition reaction



Q.6 Identify the type of chemical reaction

Reaction ZnCO3ZnO+CO2

A] Combination reaction

B] Displacement reaction

C] Double displacement reaction

D] Decomposition reaction

Q.7 When ferrous sulphate is heated strongly it undergoes decomposition to form ferric oxide as a

main product accompanied by change in colour from

a] Blue to Green

b] Green to blue

c] Green to brown

d] Green to yellow

Q.8 When crystal of Lead nitrate are heated strongly in a dry test tube

A] brown residue is left

B] A Yellow residue is left

C] white fumes appear in the tube

D] crystals immediately melt.

Q.9 In the decomposition of 2moles lead (II) nitrate to give lead(II) oxide, nitrogen dioxide and

oxygen gas, the coefficient of nitrogen dioxide C in the balanced equation) is -

a] 1

b] 2

C] 3

D] 4

Q.10 we store silver chloride in a dark coloured bottle because it is -

a] A white solid

b] Undergoes redox reaction

c] To avoid action by sunlight

d] Get oxidised

Q.11 which among the following statement is true?

Exposure of silver chloride to sunlight for a long duration turns grey due to -

a] the formation of silver by decomposition of silver chloride

b] Sublimation of silver chloride,

c] decomposition of chlorine gas from silver chloride

d) oxidation of silver chloride

Q.12 What type of chemical reactions take place when electricity is passed through water

a] Displacement

b) Decomposition

c] Double displacement

d] Combination

Q.13 Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen & oxygen gases

liberated during electrolysis of 2moles of water is

a] 1:1

b) 2:1

c) 4:1

d) 1:2

Q.14 Complete the missing

2FeSO4 Fe2O3 + SO2 + - - - - - -

a] S

b] SO

c] SO2

d]SO3

Q.15 In electrolytic cell where electrolysis is carried, anode has.

a] Positive charge

b] Negative charge

c] connected to negative terminal of the battery

d] None of these correct

Q.16 Identify the type of chemical reaction

AB A + B

OR Which type of Chemical reaction does the general chemical reaction AB A+B represent?

a] Combination reaction

b] Displacement reaction

c] decomposition reaction


Q.17 colour fumes are evolved when lead nitrate is heated?

a] yellow

b] brown

c] white

d] blue

Q.18 The correct expression for decomposition of silver chloride to silver and chlorine is

a] AgCl2 (s) Ag(s) + 2Cl(g)

b] 2AgCl(s) 2Ag(s) + Cl2(g)

c] AgCl2(s) Ag(s) + Cl2(g)

d] AgCl(s)Ag(s) + Cl(g)

Q.19 Take about 1.0g CaCO3 in a test tube Heat it over a flame, when a colourless gas comes out.

The reaction is called -------

a] decomposition Reaction and

b] Displacement Reaction

c] Double decomposition Reaction.

d) Double displacement Reaction

Q.20 In which of the following reaction, heat is absorbed generally?


b] decomposition reaction



Q.21 What is the name of reaction which decomposes after supply of heat?

a] Combination reaction?

b] Displacement Ren?

c] Thermal decomposition

d) Redox reaction

Q. 22 Which of the following is formed when lead nitrate is put under thermal decomposition ?

a] Lead oxide

b] Nitrogen dioxide

c] oxygen gas

d] All of the above

Q.23 What happens when silver bromide is exposed to sunlight?

a] Hydrogen gas is formed

b] Bromine gas is formed

c] Chlorine gas is formed

d] iodine gas is formed

Q. 24 The electrolytic decomposition of water gives H₂& O₂ in the ratio of

a] 1:2 volume

b] 2:1 volume

c) 8: 1 volume

d) 1:2 volume

Q. 25 An element ‘x’ on exposure to moist air turns reddish brown & a new compound 'Y' is

formed. The substance X & Y are

a] X = Fe Y = Fe2O3

b] X = Ag Y = Ag2S

c] X = Cu Y = CuO

d] X = Al Y = Al2O3

Answer Key

Chemical reactions and equations Decomposition reactions

1. c

2. b

3. b

4. b

5. b

6. d

7. c

8. b

9. d

10. c

11. a

12. b

13. b

14. d

15. a

16. c

17. b

18. b

19. a

20. b

21. c

22. d

23. b

24. b

25. a

Topic: Displacement reactions.

For questions below two statements are given – one labeled Assertion(A) and the other labeled

Reason (R). Select the correct answer to these questions from the codes (a),(b),(c), and (d)as given

below:

a) Both A & R are true but R is correct explanation of the assertion.

b) Both A and R are true but R is not the correction explanation of the A.

c) A is true but R is false.

d) A is false but R is true.

1. Assertion: Iron cannot displace zinc from zinc sulphate solution.

Reason : Zinc is more reactive than iron.

2. Assertion: The colour of copper sulphate solution changes on adding aluminium metal in it.

Reason : Copper is more reactive than aluminium.

3. Assertion: Zinc cannot displace iron from iron sulphate solution.

Reason : Zinc is more reactive than iron.

4. Assertion: Copper cannot displace zinc from zinc sulphate solution.

Reason : Copper is less reactive than iron.

5. Assertion: Iron can displace copper from its salt solution.

Reason : iron is more reactive than copper.

6. Assertion: Iron cannot displace aluminium from its salt solution.

Reason : Iron is more reactive than Aluminium.

MCQ’S

1. Which of the pairs of reactants show displacement reactions?

a) NaCl solution and copper metal.

b) FeSO4 solution and silver metal.

c) MgCl2solution and aluminium metal.

d) AgNO3 solution and gold metal.

2. Choose the correct order of reactivity of metals from the options below.

a) Na>K>Al> Cu

b) K>Na>Al>Cu

c) Al>K>Na>Cu

d) Na<K<Al< Cu

2. Which of the following is the correct observation for the reaction between iron and

copper sulphate solution?

a) Copper sulphate solution turns blue and reddish brown deposit of iron settles down.

b) Copper sulphate solution turns pale green and reddish brown deposit of copper settles

down.

c) Copper sulphate solution turns grey and reddish brown deposit of copper settles down.

d) Copper sulphate solution turns red and grey deposit of iron settles down.

3. Which of the following is the correct observation for the reaction of Zinc with copper

sulphate solution?

a) Copper sulphate solution turns green and reddish brown substance gets deposited.

b) Copper sulphate solution turns colourless and reddish brown substance gets

deposited.

c) Copper sulphate solution turns grey and reddish brown substance gets deposited.

d) Copper sulphate solution turns red and reddish brown substance gets deposited.

4. On adding zinc granules to freshly prepared ferrous sulphate solution a student observes

that:

a) a dull brown coating is formed.

b) a black coating is formed.

c) a greyish coating is formed.

d) no coating is formed.

6. The colour of the gas evolved on heating solid lead nitrate is

a) Yellow

b) Brown

c) greenish-yellow

d) green

7. When a cleaned iron nail is placed in copper sulphate solution, the colour of the

solution changes to

a) Blue

b) Red

c) pale violet

d) pale green

8. When zinc granules are dipped in blue coloured copper sulphate solution, the colour of solution

obtained is

a) blue

b) yellow

c) colourless

d) brown

Case study-based questions:

1. Read the following and answer questions from 1(i) to 1(v).

Reaction in which a more reactive element displaces a less reactive element from its salt

solution is called a displacement reaction. It is also called a single displacement reaction. In

all single displacement reactions one single element displaces another from its compound.

Element here may be a metal or a non metal. The displacement reaction between iron(III)

oxide and powdered aluminium is a single displacement reaction which produces so much

heat that iron metal is obtained in the molten form. Thus it is an highly exothermic process.

(i) Copper displaces which of the metal from its salt solution?

a) ZnSO4 b) CuSO4 c) AgNO3 d) FeSO4

(ii) When zinc reacts with dilute sulphuric acid, the gas evolved is

a) Brown in colour and has a pleasant odour.

b) Green in colour and foul smell.

c) Colourless, odourless and burns with a pop sound.

d) Colourtless, pungent and burns with a pop sound.

(iii) When dry hydrogen gas is passed over heated oxide of metal ‘X’, a reddish brown

residue is obtained. The metal could be

a) Pb b) Cu c) Zn d) Ag

(iv) Which of the following is an example of displacement reaction?

a) 2Mg + O2 ------- 2MgO

b) CaO + H2O -----Ca(OH)2

c) Zn + CuSO4---- ZnSO4 + Cu

d) 2FeSO4 ----- Fe2O3 + SO3 + SO2

(v) Which of the following is an incorrect statement for the reaction between Al metal

and iron (III) oxide?

a) It is also called a thermite process.

b) It is used in joining railway tracks.

c) It is an exothermic reaction also.

d) It is also a decomposition reaction.

Key Answers

Displacement reactions

1. A

2. C

3. D

4. B

5. A

6. C

MCQ

1. C

2. B

3. B

4. C

5. A

6. B

7. D

8. c

Case study

i. C

ii. C

iii. B

iv. C

v. d

Double displacement reactions

1) In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate,

a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not

available, which of the following can be used in place of lead nitrate?

(a) Lead sulphate (insoluble)

(b) Lead acetate

(c) Ammonium nitrate

(d) Potassium sulphate

2) The reaction in which two compound exchange their ions to form two new compounds is called

(a) displacement reaction

(b) combination reaction

(c) double displacement reaction

(d) redox reaction

3) The neutralization reaction between an acid and a base is a type of:

a. Double displacement reaction

b. Displacement reaction

c. Addition reaction

d. Decomposition reaction

4) Barium chloride on reacting with sodium sulphate forms barium sulphate and sodium

chloride. Which of the following correctly represents the type of the reaction involved?

(a) Displacement reaction

(b) Precipitation reaction

(c) Combination reaction

(d) Double displacement reaction

A) Only (A)

B) Only (B)

C) Only (D)

D) (B) & (D)

5) When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black

precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the

solution. The reaction is an example of :-

(a)A combination reaction

(b)A displacement reaction

(c)A decomposition reaction

(d)A double decomposition reaction

6) When dilute sulphuricacid is added to pieces ofiron sulphide, hydrogen sulphide gas is

produced and soluble ferrous sulphate is formed. The type of chemical reaction involved is

a. Decompositionreaction

b. Combinationreaction

c. Displacementreaction

d. double displacementreaction

7) A white precipitate can be obtained by adding dilute sulphuric acid to

a)CuSO4 solution

b)NaCl solution

c) BaCl2 solution

d) Na2SO4 solution

8) A white precipitate will be formed if we add common salt solution to

a)Ba(NO3)2 solution

b)KNO3 solution

c)AgNO3 solution

d)Mg(NO3)2 solution

9) What happens when lead nitrate reacts with potassium iodide?

(a) They will not react

(b) Large amount of hydrogen release

(c) Yellow ppt of lead iodide and potassium nitrate will be produced

(d) Evolution of gas will occur

10) The chemical reaction between potassium chloride and silver nitrate is given by the

chemical equation. AgNO3 + KCl → AgCl + KNO3

What can be inferred from the chemical equation?

(a) silver nitrate and potassium undergo a decomposition reaction to form silver chloride

and potassium nitrate

(b) silver nitrate and potassium undergo a displacement reaction to form silver chloride

and potassium nitrate

(c) silver nitrate and potassium undergo a combination reaction to form silver chloride and

potassium nitrate

(d) silver nitrate and potassiumchloride undergo double displacement reaction to form silver

chloride and potassium nitrate

ANSWERS

1) b: Lead acetate

2) c: double displacement reactions

3) a: double displacement reactions

4) d: b and d

5) d: a double displacement reactions

6) d: double displacement reactions

7) c: BaCl2

8) c: AgNO3

9) c: Yellow ppt. of lead nitrate

10) d:

Redox reactions

1. CuO + H2 ----> H2O + Cu, reaction is an example of -

(a) redox reaction (b) synthesis reaction

(c) neutralisation (d) decomposition reaction

2. H2S + Cl2 ----> 2 HCl + S. In the following reaction which substance has been reduced?

(a) H2S

(b) Cl2

(c) HCl

(d) S

3. Name the substance oxidized in the given reaction:

3MnO2 + 4 Al -----> 3Mn + 2 Al2O3

(a) Al

(b) MnO2

(c) Al2O3

(d) None of these

4. Name the substance reduced in the given reaction:

Cu + 2 AgNO3 ----->Cu(NO3)2 + 2 Ag

(a) Cu

(b) Ag

(c) AgNO3

(d) Cu(NO3)2

5. SO2 + 2H2S -----> 2H2O + 3S. Hydrogen sulphide is acting as-

(a) an oxidising agent

(b) a reducing agent

(c) a dehydrating agent

(d) None of these

6. Loss of electron is called ____

(a) reduction

(b) oxidation

(c) oxidizing

(d) both (a) & (b)

7. Name the oxidizing agent in the following reaction:

Fe2O3 + 3 CO ----> 2 Fe + 3 CO2

(a) Fe2O3

(b) CO

(c) Fe

(d) CO2

CASE STUDY:

Read the following paragraph and answer the questions - (1) to (4)

It is often seen that iron articles in rainy season get rusted faster than in dry weather. However,

silver articles turn black in air in any season and likewise aluminium articles when exposed to air

lose their lustre and their surface become dull after some time. Copper vessels get coated with green

layer. To protect iron from rusting, iron sheets coated with zinc quite often used such as in buckets,

iron water pipes etc.

1. When iron is exposed to air in rainy season it gets reddish brown coating of

(a) Hydrated ferric oxide

(b) ferric dioxide

(c) ferrous oxide

(d) ferrous dioxide

2. When Ag is exposed to air it gets a black coating of.

(a) AgNO3

(b) Ag2S

(c) Ag2O

(d) AgNO3

3. A substance added to food containing fats and oil is called?

a. Oxidant

b. Rancid

c. Coolant

d. Antioxidant

4. Which gas is used in packets of chips to prevent oxidation of chips?

(a) Hydrogen

(b) Oxygen

(c) Nitrogen

(d) Chlorine

Key Answers

1. a

2. b

3. a

4. c

5. b

6. b

7. a

Case Study

1. a

2. b

3. d

4. c

Effects of oxidation in Daily Life

1 Which of the following methods is not used for the prevention of corrosion?

a. greasing

b. painting

c. plating

d. Heating

2 Galvanization is a method to

a. protect the iron metal from corrosion

b. extract iron from its ore

c. protect food from rancidity

d. improve the ductility property of the metal

3 Rusting of iron could take place in

a. distilled water

b. grease

c. ordinary water

d. none of the above

4 Rusting of iron could not take place in

a. distilled water (with layer of oil above)

b. ordinary water

c. distilled and ordinary water

d. boiled distilled water (with layer of oil above)

5 When Ag is exposed to air it gets a black coating of

(a) AgNO3

(b) Ag2S

(c) Ag2O

(d) Ag2CO3

6 A substance added to food containing fats and oils is called:

(a) Oxidant

(b) Rancid

(c) Coolant

(d) Antioxidant

7 The condition produced by aerial oxidation of fats and oils in foods marked by unpleasant smell

and taste is called:

(a) antioxidation

(b) reduction

(c) rancidity

(d) corrosion

8 Which of the following gases can be used for storage

(a) Carbon dioxide or Oxygen

(b) Nitrogen or Oxygen

(c) Carbon dioxide or Helium

(d) Helium or Nitrogen

9 Observe the following activity and identify the colour of the product formed

a) Brown

b) Reddish brown

c) Black

d) Greenish Blue

10 The change in the colour of the above substance taken is due to which of the process :

a) Oxidation

b) Reduction

c) Decomposition

d) Corrosion

11 Observe the following and identify the test tube where corrosion will occur :

a) A

b) B

c) C

d) D

12 Teena visted her ancestral home in vacation. And she was surprised to see the old vehicle of

her grand father which wasn’t used for 20 years getting a brown thick coating over it. Having a

scientific explaination what could be your possible reason for same:

a) Rusting

b) Rancidity

c) Decomposition

d) Decaying

13 You must have seen the old train Engines. Having a brown colour and a rough surface.

Which of the following phenomenon explains it

a) Rough paint

b) Rusting of iron

c) Presence of copper

d) Absence of copper

14 Boilers in the industries are made up of :

a) Copper

b) Iron

c) Zinc

d) Aluminium

15 Rusting can be prevented by all the following except :

a) Painting the metal surfaces.

b) Covering in plastic

c) Oiling the metal surfaces.

d) Galvanization

16 Rancidity can be prevented using the following methods except:

a) Adding antioxidants (substances which prevent oxidation) to food.

b) Storing food in airtight containers

c) Refrigerating food also helps to slow down rancidity

d) Filling excess of air to avoid damage to food articles

17 Example of self protecting metals are :

a) Al Zn Mg

b) Al Zn Cu

c) Au Ag Sn

d) Sn Pt Cu

18 Chemical formula of Rust is,

a) Fe2O3

b) FeO

C )Fe3O4

D) Fe2O3.XH2O

19 Chemical name of Rust is :

a) Hydrated ferric oxide

b) Ferrous oxide

c) Anhydrous Ferric oxide

d) Hydrated Ferrous oxide

20 Which of the following phenomenon doesn’t occur in rusting of iron :

a) Loss of electron

b) Gain of electron

c) Gain of oxygen

d) Synthesis

21 Copper articles get green coating due to formation of

a) a layer of cupric oxide

b) a layer of basic carbonate of copper

c) a layer of cupric hydrxide

d) a layer of decayed copper

22 Process of corrosion enhanced by,

A. Air & Moisture

B. Chemicals

C. Water

D. All of above.

23. Which of the following metal does not resists the corrosion process?

A. Ni B. Cu C. Pb D. Fe

24.The process of coating of Zinc over Fe or steel is

A. Tinning B. Galvanizing C. Metal cladding D. Sheardizing

25 Coating applied must be chemically __________ to the environment. A. Inert B.

Reactive C. Soluble D. Non reactive

26. Destruction of metal starts ________.

A. At the surface

B. Just on layer below from surface

C. In the middle

D. At the bottom

27 Reddish scale of iron oxide has molecular formula __________.

A. Fe(OH)3 B. Fe2O3 C. Fe3O4 D. FeO

28 Conversion of Fe to Fe2+

is,

A. Oxidation B. Reduction C. Corrosion D. None of above

29 . Corrosion process is nothing but ________.

A. Reduction B. Oxidation C. Protection D. None of above

Answer key

1. d

2. a

3. c

4. d

5. b

6. d

7. c

8. d

9. c

10. a

11. c

12. a

13. b

14. a

15. b

16. d

17. a

18. d

19. a

20. b

21. b

22. d

23. d

24b

25a

26a

27 b

28a

29b

24. Assertion and reason

Assertion: corrosion of iron is commonly known as rusting

Reason: corrosion of iron occurs in presence of water and air.

32 Assertion :Oil and fat containing food items are flushed with nitrogen.

Reason :Nitrogen acts as an antioxidant and it prevent them from being oxidised.

Answer

31 a

32 a

--------------------------------------------------------------------------------------------------------------------

Chapter-2 Acids Bases and salt

TOPIC: INDICATORS

MCQ QUESTIONS

1) Which one of the following will turn red litmus blue?

(a) Vinegar (b) Baking soda solution (c) Lemon juice (d) Soft drinks

2. Which one of the following will turn blue litmus red?

(a) Vinegar (b) Lime water (c) Baking soda solution (d) Washing soda solution

3. Methyl orange is

(a) Red in acidic medium, yellow in basic medium

(b) Yellow in acidic medium, pink in basic medium

(c) Colourless in acidic medium, pink in basic medium

(d) Pink in acidic medium, colourless in basic medium.

4) Sodium hydroxide turns phenolphthalein solution

(a) pink

(b) yellow

(c) colourless

(d) orange

5) Which of the following indicators turn red in an acidic solution?

i.Phenolphthalein

ii. Litmus

iii. Turmeric

iv. Methyl orange

Choose the correct option:

a) (i) and (ii)

b) (ii) and (iii)

c) Only (ii)

d) (ii) and (iv)

6)Which one of the given is incorrect?

A. Acids turns red litmus paper blue

B. Aqueous solutions of acids conduct electricity

C. Acids react with certain metals to form hydrogen gas

D. None of these

7) The colour of Methyl orange in basic medium is

A. Pink

B. Orange

C. Purple

D. Yellow

8) Phenolphthalein’s colour in basic medium is ____but in acid it is ______.

A. Pink, Colourless

B. Yellow, Pink

C. Pink, Orange

D. Blue, Red

9) An indicator is one kind of the following compound

A. Strong acid only

B. Reducing agent

C. Weak base or acid only

D. Complex salt

10) An aqueous solution turns the red litmus solution blue. Excess addition of which of the

following solutions would reverse the change?

(A) Baking powder

(B) Lime

(C) Ammonium hydroxide solution

(D) Hydrochloric acid

11) Which one of the following can be used as an acid-base indicator by a visually impaired

student?

(a) Litmus

(b) Turmeric

(c) Vanilla essence

(d) Petunia leaves

12) A teacher gave two test tubes to the students, one containing water and the other containing

sodium hydroxide. She asked them to identify the test tube containing sodium hydroxide solution.

Which one of the following can be used for the identification?

(a) Blue litmus

(b) Red litmus

(c) Sodium carbonate solution

(d) Dilute hydrochloric acid

13) A solution has turned the colour of red litmus paper to blue. The pH of the solution is

approximately:

(a) 2

(b) 5

(c) 7

(d) 10

14) What happens when a base is added to vanilla?

(a) Color of vanilla changes into red

(b) Vanilla becomes colorless

(c) Vanilla loses its smell

(d) Nothing happens

15) Consider the following statements and choose the incorrect one:

[A] The red cabbage extract is also a natural indicator.

[B] The red cabbage extract remains red in acidic solution, but turns green on adding two basic

solution.

[C] Those substances whose smell changes in acidic or basic solution are called olfactory

indicators.

[D] The smell of the onion cannot be detected when acid is added to it.

16 What will be the change in the colour of china rose solution when added to acidic solution?

a) Pink

b) Yellow

c) Green

d) Blue

17) What will be the change in the colour of china rose solution when added to basic solution?

a) Pink

b) Yellow

c) Green

d) Blue

18) Coloured petals of some flowers indicate the presence of acid or base in a solution. An

example of such flower us

(a)Hydrangea

(b)Petunia

(c)Geranium

(d)All of the above

19) What will be the change in the colour of red cabbage extract when added to basic solution?

a) Pink

b) Yellow

c) Green

d) Blue

20) What will be the change in the colour of red cabbage extract when added to acidic solution?

a) Red

b) Yellow

c) Green

d) Blue

21) What will be the change in the colour of turmeric when added to acidic solution?

a) Pink

b) Red

c) No change

d) Blue

22) What will be the change in the colour of turmeric when added to basic solution?

a) Pink

b) Reddish brown

c) No change

d) Blue

23) A blue litmus paper was first dipped in dil.HCl and then in dil.NaOH solution. It was observed

that the colour of the litmuspaper-

a) changed tored

b) changedfirsttoredandthentoblue

c) changed blue tocolourless

d) remains blue in both thesolutions

24) An aqueous solution turns blue litmus solution red. Excess addition of which of the following

solution would reverse thechange?

(a) Acetic acid

(b) Sulphuric acid

(c) sodium hydroxidesolution

(d) Hydrochloricacid

25)The colour litmus solution is

a) Green

b) Blue

c) Purple

d) Red . 26) Blue petals of hydrangea in basic medium turn to

a) Red

b) Green

c) Pink

d) No change

ANSWERS

1) b: Baking soda

2) a: vinegar

3) a: Red in acidic medium , Yellow in basic medium

4) a: pink

5) d: ii) and iv.

6) d: None of these

7) d: yellow

8) a: pink and colourless

9) d: complex salt

10) d: Hydrochloric acid

11) c : vanilla essence

12) b: Redlitmus

13) d: 10

14) c: vanilla loses its smell

15) d

16) a: pink

17) c: green

18) d: all of these

19) c: green

20) : a red

21) C: No change

22) b: reddish brown

23) b: changedfirsttoredandthentoblue

24) c: sodium hydroxidesolution

25) c: purple

26) c: pink

DIRECTION :In the following questions, a statement of assertion (A) is followed by a statement

of reason (R). Mark the correct choice as:

(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of

assertion (A).

(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation

of assertion(A).

(c) Assertion(A)istruebutreason(R)isfalse.

(d) Assertion(A)isfalsebutreason(R)istrue.

(e) Both Assertion and Reason arefalse.

1) Assertion :Phenolphthalein gives pink colour in basic solution.

Reason :Phenolphthalein is a natural indicator

2) Assertion :Litmus solution is natural acid base indicator

Reason : It is a purple dye which is extracted from plant lichen

ANSWERS

1) c

2) a

Acids, Bases & Salt – Properties of Acids

Q.1 Whichgaswill be evolved when zinc metal reacts with dilute sulphuric acid ?

a) Carbon dioxide

b) Hydrogen gas

C) Oxygen gas

d) Sulphur dioxide gas

Q.2. Acids are ----- in taste

a) bitter

b) Sweet

c) sour

d) test less

Q.3 In acid which of the following change occurs ?

a) blue litmus to red

b) red litmus to blue

c) blue litmus to colourless

d) red litmus to colourless

Q.4 According to the following word equation what will be the nature of metal oxide ?

Metal oxide + Acid Salt + Water

a) acidic

b) basic

c) neutral

d) slightly acidic

Q.5 Which acid will be formed when carbon dioxide gas is dissolved in water?

a) Nitric acid

b) Formic acid

c) carbonic acid

d Acetic acid

06. Which ions will be produced when an acidputinto the water ?

a) hydrogen ions

b) hydroxide ions

c) oxide ions

d) hydride ions

07. What is the colour of dilute solution ofsodium hydroxide when few drops of phenolphthalein is added to it?

a) yellow

b) green

c) pink

d) purple

Q.8 According to the following word equation what will be the nature of non metal oxide

Nonmetal oxide + Base Salt + water

a) neutral

b) basic

c) acidic

d) slightly basic

Q. 9 which gas will be evolved when few drops of dilute hydrochloric acid is added to one gram of baking soda ?

a) Carbon dioxide

b) hydrogen

c) chlorine

d) oxygen

Q.10 The electric current is carried out through the dilute solution of acid by

a) water molecules

b) acid molecules

c) hydrogen ions

d) both water and acid molecules

Q. 11 What is the colour of turmeric when it is added in basic solution ?

a) reddish brown

b) yellow

c) Pink

d) Colourless

Q.12 Which of the following is not property of an acid ?

a) corrosive

b) slippery

c)sour taste

d) produce hydronium ions in water

Q.13 Which gas will be produced when common salt reacts with concentrated sulphuric acid

a) Hydrogen gas

b) Hydrogen chloride gas

c) oxygen gas

d) carbon dioxidegas.

014. Which of the following is a correctobservation regarding dry HCl gas?

a) moist blue litmus paper changes into red.

b) moist red litmus paper changes into blue.

c) Dry blue litmus paper changes into red

d) Dry red litmus paper changes into blue

015. What is name of the reaction which can be is represented by the following word equation

Acid + Base - Salt + Water

a)Combination of reaction

b) Reduction

c) oxidation

d) Neutralisation reaction

Q.16 . Which of the following is an example of olfactory indicator ?

a) Red cabbage juice

b) Turmeric

c) Onion

d) litmus.

Q.17. An oxide of a metal when reacts with dilute sulphuric acid it givesblue coloured aqueous solution, themetal will

be

a) Zinc

b) Aluminium

c) copper

d) Magnesium

Q.18. A solution reacts with marble to giveagas that turns lime-water milky,the solution contains

a) Licl

b) KCl

c) NaCl

d) HCl

Q.19 Two solutions when tested withphenolphthalein, it is observed thatonly A changed into pink coloured

solution,therefore

a) A is acidic and Bis basic

b) A is basic and B is acidic

C) Both A & B are acidic

d) Both A & B are basic

Q.20 A solution that reacts with few pieces of granulated, Zinc metal to give sodium zincate salt and hydrogen gas,

the solution contains

a) KOH

b) KCl

C) NaOH

d) Nacl

Q.21. According to the following Chemical reaction What will be the nature of Copper Oxide ?

CuO + 2HCl CuCl2(aq) + H2O(l)

a) Acidic

b) Slightly acidic

c) Basic

d) Neutral

Q.22. According to the following Chemical reaction what will be the nature of carbon dioxide

Ca(OH)₂+ CO2 CaCO3+H₂O

a) Acidic

b) Basic

c) Slightly basic

d) neutral

Answer Key

1. b) Hydrogen gas

2. C) sour

3. a) blue litmus to red

4. b) basic

5. c) Carbonic acid

6. a) hydrogen ion

7. c) pink

8. c) acidic

9. a) Carbon dioxide

1o. c) hydrogen ions

11. a) reddish brown

12. b) Slippery

13. b) Hydrogen Chloride gas

14. a) Moist blue litmus paper changes in to red

15. d) Neutralisation reaction.

16. C) Onion

17. c) copper

18. d) HCl

19. b) A is basic and B is acidic

20. c) NaOH

21. c) Basic

22. a) Acidic

Sub Topic: Common Between acids and bases

1. Which among the following is not a base?

(a) NaOH (b) KOH (c) NH4 OH (d) C2H5 OH

2. Which of the following is not a mineral acid?

(a) Hydrochloric acid (b) Citric acid

(c) Sulphuric acid (d) Nitric acid

3. Which of the following is(are) true when HCl (g) is passed through water?

(i)It does not ionise in the solution as it is a covalent compound.

(ii) It ionises in the solution

(iii) It gives both hydrogen and hydroxyl ion in the solution

(iv) It forms hydronium ion in the solution due to the combination of hydrogen ion with water

molecule

(a) (i) only (b) (iii) only (c) (ii) and (iv) (d) (iii) and (iv)

4. Which of the following statements is correct about an aqueous solution of an acid and of a base?

(i) Higher the pH, stronger the acid

(ii) Higher the pH, weaker the acid

(iii) Lower the pH, stronger the base

(iv) Lower the pH, weaker the base

(a) (i) and (iii) (b) (ii) and (iii) (c) (i) and (iv) (d) (ii) and (iv)

5 Which of the following statements is incorrect about an aqueous solution of an acid and of a

base?

(i) Higher the pH, stronger the acid

(ii) Higher the pH, weaker the acid

(iii) Lower the pH, stronger the base

(iv) Lower the pH, weaker the base

(a) (i) and (iii) (b) (ii) and (iii) (c) (i) and (iv) (d) (ii) and (iv)

6. Which of the following is not true for an acid :

a) Sour taste

b) Turn red litmus blue

c) turn methyl orange red

d) corrosive nature

6 Find out the odd one out

a) Citric acid

b) Acetic acid

c) Vinegar

d) Nitic acid

7 Find the odd one out

a) Nitric acid

b) Sulphurous acid

c) Sulphuric acid

d) Acetic acid

8 Which one of the following will turn the red litmus blue

a) Vinegar

b) Soft drinks

c) Baking soda

d) Lemon juice

9 Which of the following is not a characterstic of base

a) They have a bitter taste

b) They turn red litmus blue

c) They show red colour with methyl orange

d) Their aqueous solution conduct electricity

10 Which of the following is not corrosive in nature :

a) H2SO4

b) HCl

c) HNO3

d) CH3COOH

11 On adding water to sulphuric acid one of the following will not happen

a) Increase in the volume

b) Increase in the pH value

c) Decrease in the pH value

d) Decrease in the concentration

12 On adding water to sodium hydroxide which one of the following will not happen

a. Increase in the volume

b. Increase in the pH value

c. Decrease in the pH value

d. Decrease in the concentration

13 On adding water to Hydrochloric acid one of the following will not happen





14 On adding water to vinegar one of the following will not happen





15 On adding water to baking soda one of the following will happen




d) No reaction

16 On adding water to ammonium hydroxide one of the following will not happen

a) Increase in the pH

b) Increase in the dilution


d) Increase in the concentration

17 On adding water to sodium carbonate one of the following will happen

a) Decrease in the volume



d) None of the above

18 On adding water to nitric acid what observation is made

a) Increase in concentration

b) Decrease in the concentration

c) Increase in the density

d) Decrease in the pH

19 Which one of the following is a weak acid?

(a) HNO3

(b) HCOOH

(c) HBr

(d) HF


(a) HNO3

(b) CH3COOH

(c) HBr

(d) HF


(a) HNO3

(b) H2SO4

(c) HBr

(d) H2CO3


(a) HNO3

(b) HI

(c) HBr

(d) HNO2


(a) HNO3

(b) H2SO3

(c) HBr

(d) HF


(a) HNO3

(b) H3PO4

(c) HBr

(d) HF

25 Which of the following natual resources is not having any acid in them :

a) Tarmind

b) Apples

c) Proteins

d) Lime water

26 Which of the following natual resources is having any base in them :

a) Tarmind

b) Apples

c) Proteins

d) Lime water

27 Which of the following natual resources is not having any base in them :

a) Baking soda

b) Milk of magnesia

c) Proteins

d) Lime water

28 Which of the following natual resources is not having any base in them :

a) Baking powder

b) Bleaching powder

c) Milk of magnesia

d) Lime water

29 One among the following is not a base

a) Ca(OH)2

b) KOH

c) CaO

d) CaOCl2

30 One among the following is a base

a) CaO

b) CaOCl2

c) CaCl2

d) CaCO3

Answer key

1. D

2. B

3. C

4. D

5. A

6. B

7. D

8. C

9. C

10. D

11. C

12. B

13. C

14. C

15. D

16. A

17. C

18. B

19. B

20. B

21. B

22. D

23. B

24. B

25. D

26. D

27. C

28. B

29. D

30. A


Following questions consist of two statements – Assertion (A) and Reason (R). Answer

these questions selecting the appropriate option given below:

(a) Both A and R are true and R is the correct explanation of A.

(b) Both A and R are true but R is not the correct explanation of A.

(c) A is true but R is false.

(d) A is false but R is true.

1 ASSERTION: There is no change in the colour of litmus paper when brought in contact

with distilled water.

REASON: Litmus Paper is used to find whether a solution is Acidic or Basic.

2 ASSERTION: Acetic acid does not completely dissociate .

REASON: It is non-polar.

KEY ANSWERS


1. A

2. C

Acids bases and Salts - pH scale and its importance.

Q.1 Predict the pH value of the water of river Yamuna if the reason for same is high content of detergent dissolved in

it

a] 10-11

b] 5-7

c] 2-5

d] 7

Q.2 If a sample of water containing detergent is provided to you, which of the following methods will you adopt to

neutralize it?

a] Treating the water with baking soda

b] Treating the water with vinegar

b] Treating the water with caustic soda.

c) Treating the water with washing soda

Q.3 Farmers neutralize the effect of acidity on soil by adding

a] slaked lime

b] Gypsum

c] Caustic Soda

d] Baking Soda

Q.4 In which PH range does our body work to survive in the atmosphere

a] 5.5 to 8.5

b] 7.0 to 7.8

c] 2.3 to 7.0

d] 7.5 to 12.5

Q.5 To protect tooth decay one is advised to brush the teeth regularly. The ingredient of the paste which checks tooth

decay

a] acidic

b] basic

c] neutral

d] corrosive

Q.6 Nettle sting is natural source of which acid ?

A] Methanoic Acid

b) oxalic acid

c] citric acid

d ] tartaric acid

Q.7 Ant sting is a natural source of which acid ?

a] Methanoic acid

b] oxalic acid

c) Citric acid

d) Tartaric acid

Q.8 Tooth enamel is made up of

a] calcium phosphate

b] calcium carbonate

c] Calcium oxide

d] Potassium

Q.9 Medicine used during indigestion

a] Antacid

b) Antibiotic

c] analgesic

d) antiseptic

Q.10 10) The nature of calcium phosphate present in tooth enamel is.

a] acidic.

b] basic

c] amphoteric

d]neutral

Q.11 Tooth decay starts when the PH of the mouth is

a] 7

b] higher than 10

c] lower than 5.5

d] 9

Q.12Match thecolumn

Nettle Sting Oxalic Acid

Lemon Methanoic Acids

Tamarind Lactic Acid

Tomato Citric Acid

Tartaric Acid

a] 1 = ii 2 = iv 3 = v 4 = i

b] 1 = ii 2 = iv 3 = iii 4 = v

c] 1 = ii 2 = i 3 = v 4 = iv

d] 1 = v 2 = ii 3 = iv 4 = i

Q.13 When a bee stings, immediately a paste of lime is put on the sting ,why ?

a] Bee shing is made of base.

b] Bee sting is acidic due to hydrochloric acid and this is neutralised acid

c] Bee sting contains an acid called formic acid called and it get neutralized with CaO

d] Bee sting, contains oxalic acid which neutralised with CaO

Q.14 The PH of normal rainwater is

a] basic

b]acidic

c] neutral

d] alkaline

Q.15 The PHbelow which the precipitation is recorded as acid rain is

a] 6

b] 7

c] 5.6

d]7.3

Q.16 The sample of Soil from a particular placewas tested for its pH value. It came out tobe 5. Which one of the

following should be added to the soil to make it suitable for plant growth.

I] Calciumchloride ii] Calcium hydroxide

iii] Calcium oxide iv] plaster of Paris .

a] Both a & b

b] Only a

c] Both b & c

d] only b

Q.17 Ant's sting can be treated with ---------- which will neutralise the effect of the

chemical injected by the ant's sting into our skin.

a] Methanoic acid

b] formic acid

c] baking soda

d) caustic soda

Q. 18 Tomato is a natural source of which acid?

A] Acetic acid

b] Citric acid

c] Tartaric acid

d] oxalic acid

Q.19 Which acid is produced in our stomach ?Which is gastric acid present in the

Stomach composed of ?

a] Nitric acid

b] Hydrochloric acid

c] Sulphuric acid

d] Acetic acid

Q.20 Which of the following is acidic in nature ?

a] Lime water

b] Human Blood

c] Lemon Juice

d] antacid

Q.21 which acid is used in Cola to give a biting sharp taste ?

a] Sulphuric acid

b) Tartaric acid

c) Phosphoric and

d) Citric acid

Q.22 Vinegar is used in pickling as it is

a] an acid

b] prevent the growth of microbes

c] prevents drying of pickle

d] increases test

Q.23 The PH ofgastric juice is

a] < 6.5

b]>= 7.0

c] 5

Q. 24 Consider the following statements, choose theincorrect one

a) Dilute hydrochloric acid causes indigestion of food

b) Tooth decay starts when the pH of acid formed inthe mouth falls below 5.5.

c] Being basic in nature, antacids react with excessacid in the Stomach & neutralize it.

d] The bacteria present in our stomach break downthe sugar to form acid such as lactic acid.

Q.25 Which of the following is taken orally as medicine in the case of hyperacidity to get relief ?

a] Sodiumhydroxide

b] Calcium hydroxide

C] milk of sodium

d] milk of magnesia

Q.26 Which acid do we use generally toclean toilets ?

a] sulphuric acid

b) Ethanoic acid

c] Hydrochloric acid

d] citric acid

Acids bases and Salts - pH scale and its importance.

1.a

2.b

3.a

4.b

5.b

6.a

7.a

8.a

9.a

10.c

11.c

12.a

13.c

14.b

15.c

16.b

17.c

18.d

19.b

20.c

21.b

22.b

23.b

24.a

25.d

26.c

Topic → Acids bases and salts."Salts PH, family of salts Sodium Hydronide, Bleaching Powder)

1) What happens when a solution of an acid is mixed with a Solution of a

base in a test tube ?

i) Temperature of the solution decreases

ii) Temperature of the solution increases

iii) Temperature of thesolution remains the Same

iv) salt formation takes place.

a) (i) and (iv)

b) (i) and (in(ii) only

c) (ii) only

d) (ii) and (iv)

2) When hydrogen chloride gas is prepared a humid day, the gas is usually passed through the guard tube

containing calcium Chloride. The role of calcium chloride taken in the guard tube is to.

a) absorb the evolved gas

b) moiste the evolved gas.

c) absorb moisture from the gas

d) absorb ci- ions from the evolved gas

3) Which one of the following salts does not Contain water of crystallisation ?

a) Blue vitriol

b) Baking soda

c) Washing soda

d) Gypsum

4) What is formed when Zinc reach with Sodium hydroxide ?

a) Zinc hydroxide and sodium

b) Sodium zincate and hydrogen gas

c) Sodium zin - oxidee and hydrogen gas.

d) Sodium Zincate and water

5) Tomato is a natural source of which acid ?

a) Acetic acid

b) Citric acid

c) Tartaric acid

d) oxalic acid

6) Na2 C02 - 10H2 is

a) washing soda

b) baking soda

c) bleaching powder

d) tartaric acid

7) Lime water reacts with chlorine to give

a) bleaching powder.

b) baking powder

c) baking soda

d) washing Soda.

8) What is the pH range of our body?

1) 7.0-78

2) 7.2 -8.0

c) 7.0- 8.4

d) 7.2 -8.4

9) Rain is called acid rain when its

a) PH falls below 7

6) PH falls below 6

C) PH falls below 5.6

d) PH is above 7

10) Sodium hydroxide is a

a) weak base

b) weak acid

c) Strong base

d) Strong acid

11) Sodium hydroxide turns phenolphtale Solution

a) Pink

b)Yellow

c) Colourless

d) Orange

12) Bleaching powder is used as a disinfectant for water to

a) make water tastier

b) Remove all the dirt from water

c)Make gem free

d) Make water clear

13) In the following reaction, identify the salt formed.

NH4 OH (aq) + H2SO4 (aq)--->+ 2H2SO

a) NH4 NO3

b) (NH4)2SO4

c) (NH4)3PO4

d) (NH 4) 2S.

14) Range of pH scale is

a) 7 to 10

b) 0 to 10

c) 0 to 14

d) 7 to 14

15)Common Salt beside being used in the kitchen can also be used as raw material for the production of

a) Baking powder

b) Washing soda

c) Black ash

d) slaked lime

16) Common Salt beside being used in the kitchen can also be used as raw material for the production of

a) Baking powder

b) Washing soda

c) Black ash

d) slaked lime

A. b and c

B. a and c

C. a and b

D.b and d

17) What is name of salts formed by Sulphuric acid ?

a) Sulphuric salt

b) Sulphate salts.

c)Acid salts

d) Salts of acid family

18)Which of the following is known as Common salt .

a) Calcium chloride

b) potassium chloride

c) Copper cheide

d) sodium chloride.

19) Which of the following salt was prepared by Mahatma Gandhi while Dandi March?

a) Calcium chloride

b) potassium chloride

c) Copper cheide

d) sodium chloride.

20) Brine is an

a) aqueous solution of sodium hydronide

b) aqueous solution of Sodium Calbonate

c) aqueous solution of sodium chloride

d)aqueous solution of sodium bicarbonate

21) Bleaching powder is commercially produced by the action of Chlorine on ____?

a) slaked lime

b) Soda lime

c) Calcium perchlorate,

d) None of these

22) Aqueous Sodium hydroxide reacts withinwhite phosphorous to form phosphine and

a)NaH2po

b)P2O5

c)NA2PO3

d)P2O3

23) Which one of the given is the PH value of pure water ?

a) 0

b) 7

c) 8

d) 1

24) Ammonium sulphate salt is

a) Basic salt

b) Acidic salt

c) Neutral salt

d) complex salt

25) Which of the following acid (s) never forms acidic salt ?

a) HCL

b) H₂PO₃

c) H₂SO4

b) H₂CO₃

26) PH Scale of a neutral solution is

a) 14

b) 7

c) 10

d) 12

________________________________________________________________________

ANSWERS :

1. D 11. A 21.A

2. C 12. C 22.A

3. B 13. B 23.B

4. B 14.C 24.A

5. D 15.C 25.D

6. A 16.C 26.B

7. C 17.B

8. A 18.D

9. C 19.D

10. C 20.C

Subtopic – Salts ( Baking soda, washing soda, POP, water of crystallization)

Q.1 Chemical name of NaHCO3 is.

(a) Sodium Carbonate

(b) Sodium Oxychloride

(c) sodium hydrogen carbonate

(d) Sodium

Q2. Decomposition product of Baking Soda is

(a) Ca(OH)2

(b) Na2CO3

(c) NaOH

(d) Licl

Q3. Gas which makes the bread or Cake soft and spongy is

a) Ammonia

b) Hydrogen

c) Carbon dioxide

d) Oxygen

Q.4 Recrystallisation of sodium carbonate result into formation of .

(a) Baking soda.

(b) Bleaching powder

(c ) washing soda

(d) Sodium chloride

Q.5 Salt used for removing permanent hardness of water

(a) CaOCl2

(b) Na2CO3.10H2O

(C) CaSO4.2H2O

(d) CuSO4.5H₂O

Q.6. Number of water molecules present in one formula unit of Gypsum is.

(a) 5

(b) l

(C) 2

(d) 3

Q.7. Chemical name of plaster of Paris is

(a) Calcium carbonate

(b) Calcium Oxychloride

(c ) Calcium sulphate hemihydrate

(d ) Calcium hydroxide

Q.8. The hard solid mass obtained on mixing Plaster of Paris with water is

(a) Cement.

(b) Limestone

(c) Gypsum

(d) Bauxite

Q. 9 Baking powder is mixture of Baking soda and _____

a) Edible salt

(6) Edible oil

(c) Edible acid

(d) Edible fat

Q.10 Which one of the following salt do not contain water of crystallisation

(a) Baking soda

(b) Blue vitriol

(c) Gypsum

(d) Green vitriol

Q.11 At what temperature Gypsum is heated to form Plaster of Paris?

(a) 0°C

(b) 30°C

(c) 100°C

(d) 120°c

Q.12 Chemical formula of washing soda

(a) Na2Co3.12H₂O

(b) Na2Co3.5H₂O

(c ) Na2CO3.7H₂O

(d ) Na2Co3.10H₂O.

Q.13. Salt used by doctors for supporting fractured bone in the right position is

a) Calcium sulphate hemihydrate

(b) Calcium Carbonate

(c ) Calcium oxychloride

(d) Hydrated calcium carbonate

Q.14 which one of the given salt is also knownas blue Vitriol.

(a) NaCl

(b) Cuso4.5H₂O

(C) Caso4 2H₂O

(d) MgCl2

Q15. Nature shown by Baking soda in water

(a) Acidic

(b) Basic

(c ) Neutral

(d) Catalytic.

Q. 16 Which of the following salt is used an antacid

(a) Sodium Hydrogen carbonate

(b) Calcium Hydroxide

(c ) Magnesium Hydroxide

(d) All of the above

ANSWER KEY

1 c

2 b

3 c

4 c

5 b

6 c

7 c

8 c

9 c

10 a

11 c

12 d

13 a

14 b

15 b

16 d

Topic

1)Which of the following would you. Suggestas remedy when suffering from a problem of acidity after

overeating ?

i)lemon juice

Ii) Vinegar

iii) baking soda solution

iv) Curd

2) What happens when a solution of an acid is mixed with a solution of base in a

test tube ?

i) Temperature of the solution decreases

ii) Temperature of the solution increases

iii)Temperature of the solution remains the same

iv)salt Formation takes place

a) i & ii

b) i & iii

c) ii only

d) ii & iv

3) The natural indicator among the following

a) Methyl Orange

b) Litmus solution

c) Phenolphthalein

d) Iodine

4)The synthetic indicatoramong the following is

a) RedCabbage leaves

b) turmeric

c) coloured petals of flower

d) Phenolphthalein

5) Which of the following is used as olfactoryindicator ?

a) clove

b) Rose petal

c) Onion

d) Turmeric

6) Which of the following Salt does not contain water of crystallization ?

a) Blue vitriol,

b) Baking soda

c) Washing soda

d) Gypsum

7) Which of the following gas is formed when-zinc granules react with dilute sulphuric acid ?

a) Hydrogen

b) Nitrogen

c) Carbon dioxide

d)Oxygen

8 What is formed when zinc reacts withsodium hydroxide ?

a) zinc hydroxide and sodium

b) sodium zincate and hydrogen gas

c) sodium zinc oxide and hydrogen gas

d) sodium zincateand water

9) Which of the following solution is usually selected for the test of presence

CO₂gas ?

a)Ca(OH)2

b) Na2CO3

c)H2O

d) HCl

10) Which of the following gas is liberatedwhen metal carbonate reacts with anacid ?

a)H2

b)O2

c)CO2

d)SO

11) The chemical reaction in which the effect ofa base isnullified by anacid andeffect of acid is nullified by

a base known as,_______

a)Displacement reaction

b)Oxidationreaction

c)Reduction reaction

d)Neutralisation reaction

12) The chemical reaction betweenacids & metals generally produces

a)Oxygen gas

b)Hydrogen gas

c) Chlorine gas

d) Nitrogen gas

13) When hydrogenchloridegasprepared ona humid day, thegas usually passed through the guard tube

containing calcium chloride the role of calcium chloridetaken in thethe guard tube is to___________.

a) absorb the evolvedgas

b)moisten the gas.

c)absorb moisture

d) absorb Cl(-ve) ions from the evolved gas

14) Which of the following solution do not conduct electricity ?

a) Glucose solution

b) Hydrochloric acid

c) sulphuric acid

d) Nitric acid

15) Mixing an acid or basewith waterresults in decrease in the concentration of ions (H3O+/OH-) per unit

volume sucha process is called

a) concentration.

b)Crystallisation

c) Neutralisation

d) dilution

16) Which of the following factors is responsible for anacid to get its acidic properties.

a) Production of hydroxide ions

b) concentration of acid

c)Production of hydrogen ions

d) dilution of acid

17) Theprocess of dissolvingan acid or a base in water

a) Endothermic reaction

b) Exothermic reaction

c)Oxidation reaction

d) Reduction reaction

18) The pH or neutral solution is ______

a)7

b) 0

c)8

d) 14

19) In terms of acidic strength, which one of the following is in correct increasing order ?

a) Water < Acetic acid < Hydrochloric acid

b) Water < Hydrochloric acid < acetic acid

c) Acetic acid < Water < Hydrochloric acid

d) Hydrochloric acid & Water < Acetic acid

20) Tomato is a natural Source of whichacid ?

a) Acetic acid

b) Citric acid

C) Oxalic acid

d) Tartaric acid

21) Na2CO3 10H2O is__________

a) Baking soda

b) washing Soda

c)Bleaching powder

d) Tartaric acid

22)Which of the Following planet have atmospheremade of thick and white ofyellowishclouds of sulphuric

acid ?

a)Saturn

b)Earth

c) Jupiter

d) Venus

23) Our body works within the range of __________

a)7.0 to 7.8

b) 13 to 2.3

c) 13 to 13.9

d) 4.5 to 5.5

24)Sodium Carbonate isbasic salt because of it is a salt of _______

a) Strong acid & strong base

b)Weak acid 4 weak base

c)acid & weak base

d) weak& strong base

25) Alkaliesare

a) acids, which are soluble in water

b) acids, which are insoluble in water

c) bases which are in soluble inwater

d) bases whicharesoluble in water

26) Slaked lime reacts with chlorine to give

a) Bleaching powder

b) baking powder

c)bakingSoda

d) Washing soda

27)Nettle sting is naturalSource of which acid ?

a) Sulphuric acid

b) Lactic acid

c) Methanoic acid

c)Citric acid

28) At what temperature is gypsum heatedtoform Plaster of Paris ?

a)90°C

b)100°c

C)110°C

d) 120°C

29) Tooth enamel is made up of

a)Calcium Carbonate

b)Calcium oxide

c)Calcium phosphate

d)potassium

30) Which of the following helps to get the relief & irritation causeddue to stung by honey bee. ?

a) Baking soda

b) Vinegar

C) Washing soda

d) Bleaching powder

31) Which of the following is found is found in Curd ?

a) Citric acid

b)Acetic acid

C)Tartaric acid

d) Lactic acid

32) Sodium hydroxide is used

a) as anantacid

b)in manufacture of soap

c)as a cleansing agent

d) in alkaline batteries

33) Raw material used for the productionof baking soda is

a) Sodium chloride

b)Sodium Carbonate

c) sodium hydroxide

d) Calcium hydroxide

34) Which of the following isused to cure acidity of the stomach ?

a) Sodium Carbonate

b) Calcium Hydroxide

c) MagnesiumHydroxide

d) potassium Hydroxide

35)Which of the following is used in themanufacturing ofborax ?

a)Washing soda

b)Baking Soda

c) Bleaching powder

d) Common salt

36) Which of the following substance is used in fire extinguishers.

a) Washing soda

b) Bleaching powder

b) Vinegar

d) Baking soda

37)Which of the following substance isused for bleaching wood pulp in paper

factories ?

a) Bleaching powder

b) Common salt

C)Sodium hydroxide

d) Vinegar.

ANSWERS

1.C 21.B

2.D 22.D

3.B 23.A

4.D 24.D

5.C 25.D

6.B 26.A

7.A 27.C

8.B 28.B

9.A 29.C

10.C 30.A

11.D 31.D

12.B 32.B

13.C 33.A

14.A 34.C

15.D 35.A

16.C 36.D

17.B 37.A

18.A

19.A

20.C

Chapter-3 Metals and Non-Metals

Physical properties of metals and non metals

1. Due to its ___________gold is not attacked by the gases present in the air.

A] Reactivity

B] Inertness

C] hardness

D] popularity

2. Which one of the following non-metal is lustrous?

A] Iron

B]Iodine

C] Carbon

D] Chlorine

3.Metals have high density because in metals atoms are

A] free

B] loosely packed

c] closely packed

d) none of the above

4.For breakfast, Meena prepares a hot, crispy dosa in an iron pan. Which property makes it

Suitable for cooking vessels ?

A] Sonorus.

B] malleable

C] ductile

D] Good conductor of heat.

5.Silver is used in making jewellerybecause

A] Good conductor of heat

B] Ductile

C] hard

D] Good conductorof electricity

6. On Raj’s birthday his father gifts him a differentkind of metal hammer which melts when

heHolds in his hand,Identify the metal present in the hammer

a] Potassium

6] Sodium

c) Mercury

d] Gallium

7. Identify the metal x which is a poorconductor of heat .

a] Sodium

b] Lead

c] Aluminium

d] Iron

8.Chan enters the chemistry laboratory to takea spirit lamp. Assistant in the laboratory asksher to

name the metal which exists in theliquid state at room temperature

a] Mercury

b] Gallium

c] Bromine

d] sodium

9.In a chem - magic show the magician cuts acake made out of metal X

a] Gold

b] copper

c] Potassium

d] Silver

10.________ is the metal which has the lowest melting point.

a] Mercury

b] Calcium

c] Gold

dAluminium

11. In an industry, a dosa pan was manufactured but un fortunately, the metal used was poor

conductor of heat and the dosas cannot becooked on it.Identify the metal & which is apoor

conductor of heat

a] Aluminium

b] Copper

c] lead

d] Iron

CASE BASED STUDY

The ability of metals to be drawn into thinwires is called ductility. Gold is most ductilemetal you

will be surprised to know that awire of about 2km length can be drawnfrom one gram of good.

1 what is ductilityused for _____

a] To make metal into thin sheet T

b] To make metal into thin wire

2. Can one gram gold be made to thinwire of 2km?

a] No

b] Yes

3Say true or false : Gold is only a metal which is non ductile.

a] True

b] false

4 Metals are used for making cooking vessels because

a]. They are brittle

b]. They are soft

c]. They conduct heat

d]. ductility

Answer Key

Physical properties!

1. b

2. b

3. d

4. d

5. b

6. d

7. b

8. a

9. c

10. a

11. C

12.1 b

12.2 b

12.3 b

12.4 c

REACTIVITY OF METALS WITH OXYGEN

1) Ferrous sulphtate crystals are dissplved in water the colour of the solution would be

a) dark green

b) blue

c)clourless

d)pale green

2)Which one of the following metals do not react with cold water as well as hot water?

a) Na

b) Ca

c) Mg

d) Fe

3)Which of the following oxides(s) of iron would be obtained on prolonged reaction of iron with

steam?

a)Feo

b)Fe2O3

c)Fe3O4

d)Fe2O3 and Fe3O4

4)What happens when calcium is treated with water ?

a) It does not react with water

b) It reacts violently with water

c) It reacts less violently with water

d)Bubbles of hydrogen gas formed stick to the surface of calcium

5)Generally metals react with acids to give salt and hydrogen gas.Which of the following acids does

not gives hydrogen gas on reacting with metals (except Mn and Mg) ?

a) H2SO4

b) HCL

c)HNO3

d)AgNO3

6) Silver articles become black on prolonged exposure to air.This is due to the formation of

a) Ag3N

b)Ag2O

c)Ag2S

d)Ag2S and Ag3N

7)Galvanisation is a method of protecting iron from rusting by coating with a thin layer of

a) gallicum

b) Alluminium

c) Zinc

d)Silver

8)If copper is kept in air, it slowly loses its shining brown surface and gains a green coating,it is due

to the formation of

a) CuSo4

b)CuCO3

c)Cu(NO3)2

d)CuO

9)Which of the following metals is less reactive than hydrogen

a)Copper

b)Zinc

c)Magneesium

d)Lead

10)Which of the following metal reacts vigourously with oxygen ?

a)Zinc

b)Magnesium

c)Sodium

d)Copper

11)Which of the following is correct reactivity series ?

a) Na,Mg,Al,Cl

b)Mg,Na,Al,Cl

c)Na,Mg,Cl,Al

d)Mg,Al,Na,Cl

12) Copper corrodes in moist air and change to

a)Red Cu2O

b)Black CuO

c)green CuCl2

d)Green CuCo3.Cu(OH)2

* Assertions-reason type questions

In the following questions a statement of an assertion is followed by a statement of reason.use the

following key to choose the correct choice.

a) If both assertions and reason are correct and reason is correct explanation of the assertion

b)If both assertions and reason are correct and reason is not correct explanation of the assertion

c)If assertions is correct and reason is false.

d)If both assertions and reason is false.

13)Assertion : Corrosion of iron is called rusting

Reason : The formula of rust is FeO.xH2O

14)Assertion : Zinc is used in the galvanisation of iron

Reason : This prevents loss of electron from iron

15) Assertion : Zinc compound are generally soluble in water or other polar solvents

Reason :Zinc compound conduct electricity when dissolved in water.

ANSWERS :

1.D

2.D

3.C

4.D

5.C

6.C

7.C

8.B

9.A

10.C

11.A

12.D

13.C

14.A

15.B

Reaction of metals with acids

Q.1 X + HCl salt + water

X could be ____

a] CaO

b] SO3

c] SO2

d]CO2

Q.2 Na2O is ____

a] acidic

b) Basic

Q.3 A solution of element oxide x turns blue litmus red so x could be

a] Mgo

b] CO2

c] CaO

d] Na2O

Q.4 X + H2SO4 Salt + Water

a] BaO

b] SO3

c] SO2

d] CO2

Q.5 Which two elements can react with very dilute HNO3 to evolve H2 gas

a] Mg and Mn

b] Fe and Zn

c] Au and Ag

d] Cl and Fe

Q.6 Aqua regia is a freshly prepared mixture of conc. nitric acid and conc. hydrochloric acid in the

ratio ----

a] 3:1

b] 1:3

c] 2:1

d} 1:2

Q.7 Aqua regia can dissolve the metals like ____ and ____ which do not react with strong acids.

a] Gold and Platinum

b] Manganese and Magnesium

c] Copper and Iron

Q.8 ----- , ------ and ----- do no react with dilute hydrochloric acid or Sulphuric acid.

a] Cu, Hg and Silver

b] Zn, Mg and Ca

c] Al, Mg and Fe

d] K, Na and Mg

Q.9 X + 4H2O Fe3O4 + 4H2(g)

Name the metal X

a] Fe

b] Cu

c] Al

d] Zn

Q.10 ---- and ---- react very violently with dilute hydrochloric acid

a] Na and k

b] Cu & Ag

c] Cu & Mg

d} Mg & Fe

Answer Reaction of metals with acids

1. a

2. b

3. b

4. a

5. a

6. b

7.a

8.a

9.a

10.a

Topic: Reactivity of metals with water.

For questions below two statements are given – one labeled Assertion(A) and the other labeled

Reason (R). Select the correct answer to these questions from the codes (a),(b),(c), and (d)as given

below:

a) Both A & R are true but R for not correct explanation of the assertion.

b) Both A and R are true but R is not the correction explanation of the A.

c) A is true but R is false.

d) A is false but R is true.

1.Assertion: When Calcium is added in water, it starts floating.

Reason: The bubbles of hydrogen produced during the chemical reaction sticks to the surfaceof the

metal.

2. Assertion:Metals like K and Na react violently with cold water.

Reason: K and Na are alkali metals.

MCQ’s

1. Following is the order of the reactivitybased on their reaction with water ;

a) Mg> Al> Zn> Fe

b) Al> Mg> Zn>Fe

c) Mg<Al< Zn<Fe

d) Al> Zn> Fe> Mg

2. Which of the following is a correct statement about the reactivity of copper with water?

a. Copper reacts with steam to give respective metal oxides and hydrogen gas.

b. Copper does not react with water at all.

c. Copper reacts with cold water to give respective metal hydroxides along with hydrogen

gas.

d. Copper reacts with hot water to give respective metal hydroxides along with hydrogen

gas.

3. Which of the following chemical equations correctly explains the reaction of sodium with

water?

a) 2Na + 2H2O ------ 2Na2O + H2

b) 2Na + 2H2O ------ 2NaOH + H2

c) 2Na + 2H2O ------ 2Na(OH)2 + H2

d) 2Na + 2H2O ------ 2NaO + H2

4. Choose the incorrect statement among the following;

a) Pb reacts with steam to form respective metal hydroxides.

b) Al and Fe react with steam to form respective metal oxides.

c) Cu does not react with water at all.

d) Mg does not react with cold water.

Case study based questions:

1. Read the following and answer any four question from 1(i) to 1(v).

Reaction of metals with water: Metal reacts with water and produce metal oxide and

hydrogen gas. Metal oxides that are soluble in water dissolve in it to further form respective

metal hydroxides. But all metals do not react with water. Metals like sodium and potassium

react violently with cold water however calcium also reacts with water but less violently. Mg

reacts with only hot water. Al, Zn and Fe react only with steam. Metals like Pb, Cu, Ag and

Au do not react with water at all.

(i) Which of the following metals react with water to form their respective metal

hydroxides?

a) Al b) Na c) Zn d) Fe

(ii) Pb, Cu, Ag and Au do not react with water at all because

a) They are less reactive than hydrogen

b) They are insoluble in water.

c) They are noble metals.

d) They are more reactive than hydrogen.

(iii) The gas evolved during the reaction between metals and water is

a) CO2 b) H2 c) N2 d) O2

(iv) Ca and Mg float on water as

a) Gas evolved sticks to the surface of the metal.

b) Density of Ca and Mg are low.

c) Ca and Mg are porous metals.

d) Ca and Mg are insoluble in water.

(v) Which among the following are water soluble metals?

a) Na, K, Ca b) Al, Zn, Fe c) Pb, Cu, Au d) Na, Cu, Au

Assertion and reason Answers

1. A

2. B

MCQ

1. A

2. B

3. B

4. A

Case study

1. B

2. A

3. B

4. A

5. A

Reaction of metals with salt solutions Reactivity series

1) Which of the following pairs will give dis-placement reactions?

(a) FeSO4 solution and Copper metal

(b) AgNO3 solution and Copper metal

(c) CuSO4 solution and Silver metal

(d) NaCl solution and Copper metal

2) Which of the following is the correct arrange-ment of the given metals in ascending order of

their reactivity?

Zinc, Iron, Magnesium, Sodium

(a) Zinc > Iron > Magnesium > Sodium

(b) Sodium > Magnesium > Iron > Zinc

(c) Sodium > Zinc > Magnesium > Iron

(d) Sodium > Magnesium > Zinc > Iron

3) Which one of the given four metals would be displaced from the solution of its salts by

other three metals? A. Mg

B. Ag

C. Zn

D. Cu

4) Which of the following represent the correct order of decreasing reactivity?

a) Mg > Al > Zn > Fe

b) Mg > Zn > Al > Fe

c) Al > Zn > Fe > Mg

d) Mg > Fe > Zn > Al

5) Which of the following pairs of reactants will go undergo a displacement reaction?

(a) CuSO4 + Fe

(b) ZnSO4 + Fe

(c) MgSO4 + Fe

(d) Ca(SO4)2 + Fe

6)Which of the following can undergo a chemical reaction?

(a) MgSO4 + Fe

(b) ZnSO2 + Fe

(c) MgSO2 + Pb

(d) CuSO2 + Fe

7)Coppersulphate solution can be easily kept in a container made of

(a)Lead

(b) Zinc

(c) Silver

(d) Aluminum

8)Which is correct order as per the reactivity of the metals

(a) Zn > Fe > Cu > Ag

(b) Fe > Zn > Cu > Ag

(c) Cu > Zn > Fe > Ag

(d) Zn > Cu > Fe > Ag

9)In each test tube A,B, C and D 2mL of solution of aluminiumsulphate in water was filled. Clean

pieces of zinc was placed in test tube A, clean iron nail was put in test tube B , silver (Ag) was

placed in test tube C and a clean copper wire was placed in test tube D .Which of the following

option (s) is/are correct about above experiment?

(a) Zinc is more reactive thanaluminium

(b) Copper is more reactive thanaluminium

(c) Zinc is more reactive thancopper

d) Zinc, iron, silver and copper are less reactive than aluminium

10) On the basis of the sequence of the given reactions identify the most and least reactive elements X+YA→XA+Y ……..1

X + YB→XB+Y …….2

Z + XA →ZA + X…..3 (a) XandZ (b) Y andZ (c) ZandX (d) Z andY

ANSWERS

1) b: AgNO3 solution and Copper metal

2) d: Sodium > Magnesium > Zinc > Iron

3) b: Ag

4) a: Mg > Al > Zn > Fe

5) a:CuSO4 + Fe

6) d:CuSO4 + Fe

7) c: silver

8) a: Zn > Fe > Cu > Ag

9) d:Zinc, iron, silver and copper are less reactive than aluminium

10) d) Z and Y

Ionic bonding and properties of Ionic compound

Q.1 Metal atoms usually lose electron and form

a] positive ions

b] negative ions

c] new atoms

d] radiative ions

Q.2 The charge of any ion depends upon the gain or lose of

a] electron

b] proton

c] neutrons

d] positrons

Q.3 Metal atoms usually lose electron and form

a] positive ion

b] negative ion

c] new atoms

d] radioactive ions

Q.4 The charge of any ion depends upon the gain or lose of

a] electron

b] protons

c] neutrons

d] positrons

Q.5 Metals and non-metals combine toelectronic configuration of

a] alkalis

b] noblegases

c] metalloids

d] acids.

Q.6 Which of the following Statement is true about ionic compounds ?

a] Ionic compound conduct electricity when dissolved in water

b] Ionic compounds are not soluble inwater

c] Ionic compounds are crystalline solids.

D] Only A and C

Q. 7 The solution of one of the followingcompounds will conduct electricity

This compound is.

a] CCl4

b] HCl

c] CaCl2

d]CH3CL

Q.8 which of the following property is not ofIonic compound?

a] Solubility in water.

b] High melting and boiling point

c] Electrical Conductivity in solid state

d] Electrical conductivity in molten state

Q.9 Whichof the following compounds is not ionic in nature ?

a] Lithium chloride

b] Ammonium chloride

c] Calcium Chloride

d] Carbon tetrachloride

Q.10 Ionic compounds aresoluble in

a] Ether

b] Alcohol

c] kerosene

d] Water

Q.11 What is an ionic bond ?

a] Ionic bond is formed by sharing ofelectrons between two atoms.

b] It is a bond formed by the transferof electrons from an atom to another

c] Both A and B are correct

d] None of the above

Q.12 Name the ionspresent in sodium oxide compound ?

a] sodium ions

b] oxide ions

c ] Both and b

d] Neither or b

Q.13 which of the followingare electrovalentCompounds ?

a] Copper Sulphate

b] Calcium Nitrate

c] Magnesium oxide

d] All of the above

Q.14 what is the electron configuration of calcium ion (ca2+) ?

a] 2,8

b] 2,8,2

c] 2,8, 4

d] 2,8,8

Q.15 which of tire following are not ioniccompounds ?

I.KCl II. HCl III. CCl4 IV.NaCl

a] I and II

b] II & III

c] III &Iv

d] I & II

Q.16 The electronic configuration of three elementsX, Y and z are as follows.

x=2, 4 Y = 2,7 Z=2,1

Which twoelements will combine to form an ioniccompound write the correct formula

a] X2Y

b] yZ

c] XZ3

d]Y2z

Q.17 The electronic configuration of three elements X,Y and Z are

X - 2,8 Y – 2,8,7 Z – 2,8,2

Which of the following is correct ?

a] X is metal

b] Y is a metal

c] Z is a non- metal

d] Y is a non-metal and Z is a metal

Q.18 In Al2Cl6the number of electron pairs donated by each chloride ion are

a] 1

b] 2

c] 3

d] 4

Q.19 Ions have noblegas electronic configuration was suggested by

a] Kossel

b] Lewis

c] Newton

d] Russell

Q. 20In ammonium ion, the electrons requiredbetween hydrogen ion and nitrogen ion are

a] 1

b] 2

c] 3

d] 4

Q.21 Complete transfer of one or more electrons from one atom to differentatoms forms

a] ionic bonds

b] Covalent bonds

c] metallic bonding

d] co-ordinate bonding

Q.22 Pairs of outer Shell electrons not used inbonding arecalled as.

a] Valence electrons

b] loner electrons

c] electrovalent electrons

d] lone pairs

Q. 23Lattice energy of an ionic compounddepends upon

a] Charge on the ion only.

b] Size of the

c] packing of ion only

d] Charge of the ion and size of the ion.

Q. 24 Sodium Chloride easily dissolves in water. This is because

a] It is a Covalent Compound

b] Salt reacts with water

c] It is a white substance

d] Its ions are easily solvated

Q.25 When NaCl is dissolved in waterthesodiumion becomes

a] Oxidized

b] Reduced

c] Hydrolysed

d] Hydrated

Q26 Solid NaCl is a bad conductor ofelectricity since

a] In solid NaCl there are no ions

b] solidNaCl is covalent

c] In solid NaCl there is no motion of ions

d] In solid NaCl there are no electrons

Q.27 Ionic Compounds do not have

a] Hard and brittle nature

b] High melting and boiling point

c] Directionalproperties

d] Soluble inpolarsolvents.

Q.28 The nature of bonding in graphite is

a] covalent

b] Ionic

c] Metallic

d] Coordinate

Q.29 Which type of bond is formed between similar atoms ?

a] ionic

b] covalent

c] coordinate

d] metallic

Q.30 Covalent compounds are generally ------------ in water

a] soluble

b] Insoluble

c] Dissociated

d] Hydrolysed

Q.31 A covalent bond is likely to be formedbetween two elements which

a] Have similar electronegativities

b] Have low ionization energies

c] Have low melting points

d] Form ions with a small charge

Answer Keys

1.a

2.a

3.a

4.a

5.b

6.d

7.c

8.b

9.d

10.d

11.b

12.c

13.d

14.d

15.b

16.b

17.c

18.b

19.a

20.b

21.a

22.d

23.d

24.d

25.d

26.c

27.c

28.a

29.b

30.b

31.a

chemical reactions and equations topic- chemical reactions

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