06 “Press forward. Do not stop, do not linger in yourjourney, but strive for the mark set before you.”

– George Whitefield

PRACTICE CHEMISTRY FORMULAE

SECTION - I (40 MARKS)Attempt all questions from this section.

Q1 a) Choose the most appropriateanswer. [5]

i) The unsaturated hydrocarbons undergo:a) Substitution reaction b) Addition reaction c) Oxidation reaction d) None of theseii) Nitroglycerine and nitrotoluene are:a) Fertilizers b) Explosivesc) Fibres d) Detergentsiii) Rotten egg smell is due to the liberation of:a) HCl gas b) Cl2 gas c) H2S d) SO2 gasiv) A metal which reacts with dilute HCl toliberate hydrogen:a) Zn b) Cu c) Ag d) Pbv) On moving from left to right across aperiod of the periodic table, the non-metal-lic character of the elements_____a) Increases b) Decreasesc) Remains the same d) None of theseb) Give the structural formula of thefollowing: [5]i) Acetone ii) Marsh gas iii) Vinegar iv) But-2-yne v) Hexane-3-onec) Give one word/Chemical term forthe following: [5]i) The element with the least ionizationpotential in the third period.ii) Process by which Sulphur is boiledwith rubber.iii) The common name of carbamide.iv) A chemical in which gold can dissolve.v) Process by which ethene is obtained byethanol.

d) Match the items given in column Awith the most appropriate ones in col-umn B and rewrite the correct matching pairs. [5]

Column A Column Bi) Proton a. An alkali metalii) Sodium b. Halogeniii) Barium c. Noble gasiv) Chlorine d. Alkaline earth metals(v) Completed shell e. Responsible

for nuclear chargef. Occupied sub-shell

e) Name the gas that is produced ineach of the following cases: [5]i) Diluted hydrochloric acid is added tosodium thiosulphate.ii) Action of nitric acid on limestone.iii) Solution of ammonium chloride andsodium hydroxide are mixed and heated.iv) Iron sulphide is treated with dilutedsulphuric acid.v) Ethene is burnt in excess of oxygen.f) Define the following terms: [5]i) Pyrolysis ii) Electron affinityiii) Isomerism iv) Bridge elementsv) Catenationg) Observe the table given below andanswer the questions based on it. [5]

In the above table H does not representhydrogen. Some elements are given in

their own symbol and position in the periodic table while others are shown witha letter. Answer the following questions:i) Identify the most electronegative ele-ment. ii) Identify the most reactive ele-ment of group 1-IA. iii) Identify the element from period 3 with least atomicsize. iv) How many valence electrons arepresent in Q? v) Identify the noble gas ofthe fourth period.h) Write down the two uses of the following compounds. [5]i) Ethene ii) Methane iii) Ethyl alcohol iv) Acetic acid v) Ethane

SECTION - II (60 MARKS)

(Attempt any 4 questions from this section).

Q2 a) Give a chemical test to distin-guish between: [2]i) Dilute sulphuric acid and dilutehydrochloric acid (using barium chloride)ii) Dilute sulphuric acid and concentratedsulphuric acid (using lead nitrate)b) Give reasons for the following state-ments. [3]i) Concentrated sulphuric acid is kept inairtight bottles. ii) Red brown vapours areproduced when concentrated sulphuricacid is added to hydrogen bromide. iii) Apiece of wood becomes black when con-centrated sulphuric acid is poured on it.

c) With the help of a well-labelled dia-

gram explain that the HCl gas is high-ly soluble in water. [5]

Q3 a) The molecules of alkene familyare represented by a general formulaCnH2n.Answer the following questions basedon it: [4]i) What do n and 2n signify? ii) What is thelowest value which can be assigned to n? iii) What is the molecular formula ofalkene, when n = 4?iv) What is the structural formula of thefirst member of the alkene family?b) The questions below are related tothe manufacture of ammonia: [3]i) Name the process.ii) In what ratio must the reactants betaken?iii) Name the catalyst used.iv) Give the equation for the manufactureof ammonia.v) What is the percentage formation ofammonia? vi) How can this percentage formation beincreased?c) Give three tests for the identificationof the ammonia gas. [3]

Q4 a) What do you understand by thefollowing terms: [2]i) Aqua fortis ii) Aqua regia b) Ammonia is used in the Ostwaldprocess, answer the following questionbased on it. [2]i) Give the source of reactants used in theprocess. ii) Name the catalyst used in theprocess. iii) Name the oxidizing agentused in this process. iv) What is the ratioof ammonia and air taken in this process?c) Give the salient features of the modern periodic table. [6]

Q5 a) Give balanced equations for thelaboratory preparations of the follow-ing organic compounds. [4] i) A saturated hydrocarbon fromiodomethane. ii) An unsaturated hydro-carbon from an alcohol. iii) An unsaturat-ed hydrocarbon from calcium carbide.iv) An alcohol from ethyl bromide.b) Give reasons for the following statements: [3]i) Pure acetic acid is known as glacialacetic acid. ii) Ethyne is more reactive

than ethane. iii) Hydrocarbons are excel-lent fuels.c) While diluting concentrated sulphuric acid the acid should beadded to water and not water to theacid. Explain. [2]d) State one condition under whichchlorine and hydrogen react to formhydrogen chloride gas. Give balancedequation for the same. [1]

Q6 a) Explain various steps in the manufacture of sulphuric acid by contact method: [5] i) Production of sulphur dioxide.ii) Purification of gases.iii) Catalytic oxidation of sulphur dioxide.iv) Absorption of sulphur trioxide in sulphuric acid.v) Dilution of oleum to obtain sulphuric acid.b) Write four favourable conditions forthe conversion of SO2 to SO3 (contactprocess). [4]c) Give two uses of Sulphuric acid. [1]

Q7 a) Write a balanced chemical equation for each of the following:[10]i) Preparation of ethane from alkyl halide.ii) Action of cold and dilute Nitric acid oncopper.iii) Reaction of Ammonia with heated copper oxide.iv) Action of concentrated sulphuric acidon Sulphur.v) Laboratory preparation of ammoniafrom ammonium chloride.vi) Action of alcoholic KOH on bro-moethane.vii) Action of dilute hydrochloric acid onmagnesium sulphite.viii) Reaction of sodium with ethanol.ix) Preparation of ester using carboxylicacid.x) Catalytic hydrogenation of ethyne.

DR SONIA KALE, VIDYA PRATISHTHAN’S NANDED CITY PUBLIC SCHOOL, PUNE, PRESENTS A CHEMISTRY MOCK PAPER FOR CLASS X

GENERAL INSTRUCTIONS1 Answers to this question paper must bewritten on the paper provided separately.

2 You will not be allowed to write duringthe first 15 minutes. This time is to bespent in reading the question paper.

3 The time given at the top of this paper isthe time allowed for writing the answers.

4 The intended marks for questions orparts of questions are given in brackets [].

These questions and the marks alongside are meant only for practice

purpose. Students are advised to checkformat, syllabus and marks for Board

test papers with their teachers.Questions have been given by teachers

and NIE is not responsible for them.

MOCK PAPERCHEMISTRY

CLASS X, ICSETOTAL MARKS 100

Nothing beatsself-study

Smruti Jain scored 99%to emerge as topper atThe Bishop’s Co-EdSchool, Kalyani Nagar,Pune, in ICSE. She shares her studypattern and underlinesthe importance of taking small breaks

School Topper: I was stunned. Though Iwas expecting decent marks, this was

above my expectation.

Success Mantra: Keep it simple,be regular instead of rushing at the eleventh hour.

Study Routine: I did not take any tuition. Idid three to four hours of self-study daily, with shortbreaks; and the most necessary thing was one hour ofrecreation.

Stress Busters: Basketball, music and dance.

Love & Dislike Sub-jects: My favourite sub-jects are Hindi and math.I did struggle quite a bitwith physics.

Time Man-agement: Inever boundmyself to afixed time-table. Whateverand whenever I feltlike, I studied.

My Philosophy: Ifyou are determined tolearn, no one can stopyou.

Credit Goes To: My teachers, the AlmightyGod, and my parents.

Board Year Tips: Keep calm, never underestimate yourself and trust

your teachers.

Future Plans: I aspire to be a radiologist.

A Word For Juniors: Trust and inspire yourself; youare the creator of your own destiny!

SCORE CARDEnglish: 96

History, civics andgeography: 99

Mathematics: 100

Science: 100

Computer applications: 100

Sleep is important for health. Here’s why... Sound sleep is one of the pillars of good health. You cannot achieve optimalhealth without taking care of your sleep. A good night’s sleep is just as impor-tant as eating healthy and exercising. Unfortunately, children are now sleepingless than they did in the past, and sleep quality has suffered as well

Here are some reasons why good sleep is important for children

Shimna C P, Social Science Teacher, Diya Academy of Learning, Bengaluru

Goodsleep can max-

imise problem-solv-ing skills and enhancememory. Poor sleep

impairs brain function.

A good night’s sleep is the key to a

healthy lifestyle

Sleepaffects your body’s

inflammatory responses.Poor sleep is strongly linked

to inflammatory bowel dis-eases and can increase

your risk of diseaserecurrence.

Poorsleeping

patterns are stronglylinked to depression,particularly for those

with a sleeping disorder.

Sleepdeprivation

may reduce yoursocial skills and ability

to recognise people’s emo-tional expressions.

Amplesleep

improves manyaspects of athletic and

physical per-formance.

Poor sleep affects hormones that regulate appetite.Those who get adequate sleep tendto eat fewer calories than those

who don’t.

When we sleep, weproduce cytokines. These

are proteins which the bodyuses to fight infection,

stress, and illness.

Sleep is essentialfor healthy growth in

children, as growth hormonesare primarily secreted dur-

ing deep sleep.

Short sleep duration isassociated with a drastical-ly increased risk of weight

gain and obesity, in bothchildren andadults.

MOCK PAPERS

W en I sit to study, I keep myselffocused by thinking of theend goal.When you have

something you want to achieve, work-ing for it becomes easier. If Iever get distracted, I revisesomething I have al-ready learned so thatI can retain my fo-cus again. Also,putting asidesome time forother activitieswhich I can doafter I finishstudying, moti-vates me to workharder. An in-centive to studyproperly alwayshelps in increasingconcentration.

My plan includes studying fortwo hours during weekendswhere I can solve extra ques-

tions to increase my understanding ofa concept. During school days, I

revise what I have learnt thatday so as to improve my

retention power. Also, nottaking too much stress

while still takingboards seriously iscrucial to performwell. So time man-agement is the key.I try to balance thetime I use for slack-ing off to read some-

thing which will ben-efit me or by surfing

the net for research onthe school projects to be

completed.

For snacking when Istudy, I prefer going forsomething nutritional

yet tasty. A ccaarrrroott-cchhuuttnneeyyssaannddwwiicchh is a great way tosatiate hunger pangs and it’shealthy too.

It’s My Board YearTIME TO FOCUS MY STUDY PLAN Mix carrot and salt in a bowl. Add

mayonnaise and mix well.

Mix cottage cheese and salt in another bowl and mash well. Add greenchutney and mix.

Take 3 bread slices for each sandwich.On one slice, spread carrot filling, coverit with second slice and spread cottagecheese-green chutney mixture on it. Topit up with the third bread slice.

Press gently. You can trim thesides of each sandwich and cut itinto two pieces before serving.

RECIPE

CARROT

CHUTNEY

SANDWICH

INGREDIENTSGrated carrot 1 cup

Green chutney 4 tbsp

Brown bread slices 12

Salt to taste

Eggless mayonnaise 2 tbsp

Grated paneer (cottage cheese) 1 cup

Aashnaa Mehta, class X, B K Birla Public School, Kalyan