NARAYANA IIT ACADEMY INDIA

SR INTER MCQ SPECIAL TEST DATE: 03-05-2016 _______________________________________________________________________________________

MULTIPLE CHOICE QUESTIONS MATHS:

PHYSICS:

CHEMISTRY:

1.

By considering the above half cell reactions for the given half cell reaction which of the

following conclusions are correctly drawn:

(a) The equilibrium constant of the reaction is (b) The standard potential of reaction is

(c) At equilibrium the (d) When the concentration of are 1M each then if pH the solution is

decreased the extent of reaction will increased 2. Which of the following is / are not correct .

(a)At given temperature the difference of pressure of moist gas and the pressure of dry gas depend on the nature of gas.

(b) At given temperature work done by the ideal gas is lesser than that of the kinetic energy possesed by it

(c) At constant temperature if the ideal gas is allowed to diffuse at different pressures, then the

ratio of rate of diffusions are (d) average kinetic energy of a gas at a particular temprature does not depend upon the nature of the gas

3. Which of the following are correct statements (a) Free electrons will be always found in their lattice in ionic compounds having metal

excess defect

(b) can produce both stoichiometric and non stoichiometric defects . (c) AgCl has cation frankel defect and CaF2 has anion frankel defect . (d) Solid NaCl having schottky defect does not show electrical conductance 4. Choose the correct reason(s) for the stability of the lyophobic colloidal particles . (a) Preferential adsorption of ions on their surface from the solution . (b) Preferential adsorption of solvent on their surface from the solution . (c) Attraction between different particles having opposite charges on their surface .

(d) Petential difference between the fixed layer and the diffused layer of opposite charges around the colloidal particles .

5. In lead storage battery lead as anode and lead coated with PbO2 as cathode are arranged in conc.H2SO4. During the discharge of battery the changes taking place are, [mAh=milli ampere hour].

(a) pH of solution will increase (b) Weight of negative terminal increases and weight of positive terminal decreases (c) Number of mAh delivered depends on concentration of sulphuric acid (d) With time the reaction quotient of the cell reaction gradually increases

03 26OH Br BrO 3H O 6e E 0.35V

022OH Br BrO H O 2e E 0.93V

3 2BrO 4OH BrO 2H O 4e 41 10

0.06 V

3BrO BrO

3BrO and BrO

1

2

PP

SNaCl

6. At room temperature in the ideal structure of the cesium ions are found in the cubical voids produced by chloride ions.

Therefore the correctly drawn conclusions about the given structure are. [Given; radius of ; radius of ;the structure

follow radius ratio rule] (a) With in their layer, the chloride ions are not in contact with each other. (b) The nearest distance between any two adjacent cesium ions is 182 picometer (c) The distance between adjacent cesium ions with in the horizontal plane is 400 picometers (d) Along the diagnol plane of lattice the ions are in contact with each other. 7. Consider the given equilibrium

[Assume; only is formed; vapour pressure of is

negligible; is 100% insoluble; every change is 100% efficient.]

At constant temperature the partial pressure of can be enhanced by

(a) Adding dry at constant volume

(b) Adding dry at constant volume (c) Adding inert gas at constant volume (d) Decreasing the volume of container 8. Consider the chemical reaction at its equilibrium. Identify the correctly drawn conclusions. (a) At constant temperature and pressure addition of inert gas increases the entropy so much

that outweights the enthalpy change (b) For a reaction if remain constant over the given range of temperature then

the equilirbium constant varies linearly with temperature. (c) For a reaction if if changes over the given range of temperature then the

equilirbium constant varies linearly with temperature. (d) For a reaction if as well as changes over the given range of temperature then

the equilirbium constant varies non linearly with temperature. 9. At constant temperature the following equlibrium is existing and it is shown with

unfragmented thick line in the given diagrams .

The existing equilibrium can be disturbed by adding or but the

system approch to come back to similar equilibrium. Identify the correct graphical representation of deviation and approach toward similar equilibrium is representated through fragmented line.

(a) (b)

CsCl

Cs 164.4 picometer Cl 182 picometer

2g g 2 g 2 gCO H O CO H H ve

2 3 2 sNa CO .10H O 2 3 2 sNa CO .10H O

3 sCaCO

2 gH

sNaOH

2Ca OH

H and S

H and S

H S

2 2

4 S aq aqSrSO Sr SO

3 2Sr NO 2 4K SO

Sr2+

SO42

Addition of Sr(NO )32

[ ]

[ ]

Sr2+

SO42

Addition of Sr(NO )32

[ ]

[ ]

(c) (d) 10. Which of the following are correct statements. (a) Surface energy of the colloidal particles decreases when the charged particles adsorb over

them . (b) The conductivity of solution having surfactant molecules decreases sharply at critical

micelle concentration when the solution is above its kraft temperature. (c) Colloidal particles having hydrophilic and hydrophobic parts can act as surfactants (d) Ionic micelle doesnot require the adsorption of charged particles for their stability. 11. Which of the following relations become correct on applying for one mole of ideal gas under

reversible change

(a) (b) (c) (d) 12. Identify the correctly given statements (a) Enthalpy change during isothermal isobaric mixing of perfect gases are zero (b) Free energy change during isothermal isochoric mixing of perfect gases are positive (c) Entropy change of sourroundings in isothermal isobaric mixing of perfect gases are zero (d) Free energy change during isothermal isoentropic mixing of perfect gases are zero 13. Identify the correctly represented effect of added reagent on the given equilibrium at constant

temperature.

[Use ; is well soluble in water] (a) Addition of KOH will shift the equilibrium towards right (b) Addition of will shift the equilibrium towards right (c) Addition of will shift the equilibrium right (d) Addition will shift the equilibrium towards right 14. 20 gms of non -volatile and non electrolyte solute is dissolved in 108gms of water the

Vapour pressure is decreased from 100 to 98 mm of Hg. The correct statements is/are.(assume the solution is very dilute; Kf of water = 1.89 K .Kg.mol-1; Kb of water = 0.54 K .Kg.mol-1 )

(a) The solution is isotonic with 1 molal urea (b) Boiling point of solution is 100.6ºC (c) F.P. solution is – 2.1ºC

(d) Molecular wt of solute is

Sr2+

SO42

Addition of K SO2 4

[ ]

[ ]

Sr2+

SO42

[ ]

[ ]Addition of K SO2 4

T

dS RdV V T V

dS dPdV dT T T

dU dHdV dP P

dG SdT

2 2

2 27 aq aq 4 aqCr O 2OH 2CrO H O 10

4 2 7Ksp of BaCrO 1 10 ;BaCr O

2BaCl

2H O

2 3Na CO

10006

15. Which of the following statements are given correctly . (a) During the dissolution of gas in a given solvant , with temperature henry’s constant

decreases (b) At given temperature easily liquifiable gas has lower henrys constant than non liquifiable

gas . (c) At given temperature gas having higher critical temperature will have lower henrys

constant than the gas having lower critical temperature . (d) At given temperature polar gas has higher henrys constant than that of non polar gas. 16. At TK which of the following statements are true. (a) If activation energy of reaction is zero then the influence of catalyst over such reaction is

negligible . (b) Influence of catalyst is appreciable when it is added to reaction at lower temperature. (c) In irreversible reaction the catalyst will increse the rate as well as extent of reaction. (d) In reversible reactions the catalyst increases the rate of both forward and backward

directions but extent of forward reaction only will increase. 17. Consider the following mechanism along with energy profile diagram.

Identify the correctly drawn statement/s (a) In rate determining step (ABC) is participating (b) order with respect to A and B are one each (c) conc. of C at point 1 and 2 are different but at point 1 and 3 are same. (d) C is acting as catalyst. 18. The emf of working Galvonic cell dependens on: (a) Size of electrode (b) conc. of the ion participating in electrode reactions (c) No. of electrons involved in electrode reactions (d) stoichiometry of reaction 19. Identify the correct statements.applicable for hydrogenic orbitals (a) The Z- component of S-electrons is zero. (b) when the Z- component of electrons of sub-shell changes their radial probability remains

same (c) If the Z- component of P-electron is zero then its angular node around the Z-axis is zero (d) Electrons having same orbital angular momentum can posses different Z-components 20. At 25ºC the given galvonic cell is constructed

(a) the entropy change of cell reaction is zero.

(b) the emf can become negative if the pressure of in left half cell is increased (c) If the conc. Of in left half cell is made less than 1M , the emf become positive (d) of cell reaction are zero.

4321

Potential energy

Reaction progress

A B C ABC

ABC AB C

AB P

2 g aq aq 2 gPt.H H H H .Pt

P 1Bar 1M 1M P 1Bar

2 gH

H

0G and G

21. Which of the following are correct statement (a) In metallic element of unit cell of BCC structure the maximum number of atoms found

on any plane can be 5 (b) In metallic element of unit cell of CCP structure the maximum number of atoms found

on any plane can be 6 (c) In metallic element of unit cell of HCP structure the maximum number of atoms found

on any plane is 7 (d) Distance between nearast lattice points in the unit cell of BCC is more than that of to

lattice points of FCC unit cell. 22. Which of the following statements are true.

(a) Magnetic quantum number represents quantized value of z-component of angular

momentum of the electron in an orbital through the expression (b) If is the angle between z-axis and angular momentum vector then

where m = magnetic quantum number ; = azimuthal quantum number

(c) For 3d subshell the value of and value for 3dz2 will be equal to zero

(d) For 3p subshell the value of and value for 23. Which of the following statements are true. (a) Brownian motion depend on nature of colloidal particles. (b) True solutions do not show tyndall effect (c) colour of milk will remain same when it is observed through reflected light as well as

through transmitted light. (d) Persistent dialysis enhances stability. 24. Which of the following statements are true. (a) The anion stronger basic than will undergo hydrolysis in aqueous medium

(b) The acid stronger than will be completely ionised and exist as their conjugate base in aqueous medium

(c) is stronger basic than hence its strength is levelled to in aqueous medium

(d) Cation stronger acidic than will undergo hydrolysis. 25. 0.25 g of nitrogen sample on kjeldal treatment, the distilled ammonia is completely absorbed

intoof 0.1 M aqueous solution of HCl. the excess of acid was completely neutralised by 25 ml of 0.2 M NaOH solution.

Identify the correctly drawn conclusions. (a) Nature of solution is acidic (b) At 25ºC the pH of resultant solution is 5.4 (c) Concentration of ammonium is 1.25M (d) Further addition of 1ml of 2.5M NaOH, the pH of solution becomes 9.4 26. Which of the following changes are correctly applicable to the operating galvonic cell (a) Entropy change is always positive (b) Enthalpy change is always negative (c) If temperature co-efficiency is zero then enthalpy change must be positive (d) If temperature co-efficiency is negative and if enthalpy change is also negative then

zhL m

2

m ( 1).cos

2

2 x3p 1

OH

3H O

2NHOH OH

3H O

5b 4K NH OH at 25º C 2.5 10

H S

27. 1 litre of 1molar aqueous solution of is electrolysed by applying 386 amperes of current for 500 seconds in presence of impure copper anode [only Pb is present as impurity] and pure copper as cathode. Which of the following changes can be observed at the end of electrolysis. [GAW of Pb= 208; GAW Cu = 63.5 ; volume of solution remain constant ; PH of solution remain at 1; At both anode and cathode only most preferable changes are taking place ]

(a) Increase in weight of cathode is 63.5g (b) Conc. of in the solution is (c) Conc. of in the solution is

(d) Conc. of will remain at 1M 28. A open ended mercury manometer is used to measure the pressure exerted by a trapped gas

as shown in the figure. Initially manometer shows no difference in mercury level in both columns as shown in diagram. After sparking ‘A’ dissociates according to following reaction

If pressure of gas ‘A’ decreases to 0.4 atm. Then which of the following are true statements

(assume temp. to be constant at 300K)

(a) Total pressure increased to 1.1 atm (b) Total pressure increased by 0.6 atm (c) Total pressure increased by 7.6 cm of Hg (d) Difference in mercury levels of two limbs is 76 mm

29. 1 mole of ideal crystal of is made impure by heating along with , the impure crystal is then dissloved in 1 litre of water at 25ºC.As a resutlt the impure ions of crystal have undergone hydrolysis upto 80%, further hydrolysis and other changes have become negligible . Assume in impure form also the ideal crystal is existing

[Use ] (a) pH of solution is 9.7 (b) pH of solution in 3.3 (c) conc. of in the solution is (d) Percentage of cationic vacancies in impure crystal is 30. Which of the following statements are correctly given about the real gas obeying

vanderwaals equations. (a)Existance of intermolecular attractions is responsible for negative deviation from ideality

(b) Higher for a gas shows existance of highier excluded volume. (c) At Boyles temp. the intermolecular attraction just balance the intermolecular repulsions (d) Between ciritical temperature and boyles temperature gas shows positive diviation.

2Pb 101 10 M2Pb 201 10 M

24SO

1 2A(g) B(g) C(g)2 3

gas A

Hg

P=76cm

NaCl 2 sZnCl

14 122Kw 1 10 ;Kb 5 10

2Zn 46.25 10 M26.25 10

C

C

TP