SECTION-IAttempt all questions from this section

Q.1 A) Name the followingi) The neutral gas evolved when ammonia ispassed over lithargeii) The hydrocarbon commonly known asmarsh gasiii) The black amorphous substance thatproduces a greenish yellow gas withconc.HCliv) The ion that produces a golden yellowflame in flame testv) The neutral gas formed on thermal decom-position of Cupric nitrate.

B) State one relevant observation for each ofthe followingi) Copper is treated with conc nitric acidii) Hydrogen is passed over copper(II)oxideiii) Ethene gas is passed through dil. alka-line KMnO4 solutioniv) Dil. Sulphuric acid is added to zinc sul-phidev) At the cathode when fused lead bromide iselectrolysed using graphite electrodes.

C) Choose the most appropriate answer foreach of the following:i) An element that has same number of elec-trons in the K and L shellsa) He b) Be c) C d) Oii) Which of the following has the maximummass(Cl=35.5 H=1 N=14 O=16)

a) 1 mole of chlorine gas b) 22.4 litres of hydrogen gas at 1 atmos-

pheric pressure and 273 Kc) 6.023 *10²³ Molecules of ammoniad) 3 gram atoms of Oxygen

iii) The homologous series to which thehydrocarbon having the formula C5H8belongs to:a)Alkane b)Alkene c)Alcohol d)Alkyneiv) The substance whose solution has bothions and moleculesa) Ammonium hydroxide b) sugar solution c) sodium chloride d) alcohol

v) A hydrocarbon has the formula C4H10 itsvapour density is (C=12 H=1)a) 58 b) 26 c) 24 d) 116

D) Give appropriate scientific reasons for thefollowing statements:i) Atomic radius of lithium is more than theatomic radius of fluorine.ii) Sulphuric acid forms both acidic and nor-mal salts whereas hydrochloric acid formsonly normal salts with bases.iii) Ammonium Nitrate is not used in labpreparation of Ammonia.iv) Members of the homologous series havesame chemical properties but different phys-ical properties.v) Formation of the ionic compound calciumoxide is an example of a redox reaction.

E) Give balanced chemical equations for theconversions A,B,C,D and E

A B Ci) AI AIN NH3 N2

D Eii) Fe FeCI2 Fe(OH)2

F) Complete the following calculations.Showworking for complete credit:i) A hydrocarbon has the following percent-age composition:Hydrogen-2.2%, Carbon-26.6% and Oxygen-71.2%. Calculate the empirical formula ofthe compound. If the molecular weight=90Find its molecular formula .[Atomic masses: C=12, H=1, O=16] ii) Thevapour density of a gas is 8.5.Calculate i)Weight in grams ii) The number of moles ,in

8.96 dm3 of gas at STPiii) Calculate the percentage composition ofwater of crystallization in hydrated sodiumcarbonate (Na2CO3.10H2O) (Na=23 C=12 O=16H=1)

G) Draw structural formulae and giveIUPAC names for the following organic com-pounds: [5]i) An alcohol containing 3 carbon atoms.ii) The third member of the homologousseries of alkynes.iii) The carboxylic acid formed on oxidationof ethanol.iv) The compound formed on reduction ofethyl bromide with Zn-Cu couple in alcoholv) The alkyl halide that on treating withalcoholic KOH give ethyne.

H) Identify the ion present in each of the fol-lowing compounds:i) A salt M which on treatment with silvernitrate solution produces a curdy white pre-cipitate that is soluble in excess of ammoni-um hydroxide solution.ii) A salt Y which give a pale blue precipitatewith sodium hydroxide solution that is insol-uble in excess of sodium hydroxide solution.iii) When Dilute Sulphuric acid is added tosalt N a colorless gas with a smell of rotteneggs is liberated that turns a lead acetatesolution shiny black.

SECTION-IIAttempt any four questions from this section

Q.2 A) Copy and complete the following tablerelating to the important industrial process-

es and its final output

B) Give suitable chemical terms for the fol-lowing:i) A bond formed by a shared pair of elec-trons with both electrons coming from thesame atom.ii) The ratio of mass of certain volume of agas to the mass of same volume of hydrogeniii) The 'Hydroxy' derivatives of alkanesobtained by replacement of hydrogen atomsof alkanes iv) The property of conc.sulphuric acidexhibited when it reacts with sugarv) The compound that undergoes partial dis-sociation in fused or aqueous state and is apoor conductor of electricity.

Q.3 A) Give balanced chemical equations forthe following conversions:i) Sal ammoniac to ammoniaii) Potassium hydroxide to potassium chlo-rideiii) Ethanol to Ethaneiv) Aluminium to sodium aluminatev) Lead nitrate to litharge

B) An element X has atomic number=13i) To which period does it belong.ii) Give equation to show the discharge ofion X at the respective electrode during elec-trolysis of fused salt of X.iii) What type of oxide will X form.iv) Give formula of sulphate of X.v) If boron belongs to the same group as Xhow many valence electrons are there inboron.

Q.4 A) Name the gas evolved when the fol-lowing mixtures are heated:i) Conc HCI and potassium dichromateii) Conc sulphuric acid and Sulphuriii) sodium chloride and conc. Sulphuricacid

B) From the list of salts choose the salt thatmost appropriately fits the description givenbelow:(K2CO3,PbCI2,NaCI,CaSO4,NH4NO3,Pb(NO3)2]i) A salt on thermal decomposition does notleave any residue.ii) A salt prepared by titration method.iii) A salt that is prepared by double decom-position method.iv) A salt that gives a white precipitate with

barium chloride solution which is insolublein excess of dilute hydrochloric acid.v) A Salt that on treatment with acetic acidliberates a colorless gas that turns limewater milky.

C) 450 cc of CO and 200 cc of oxygen aremixed together and ignited.calculate thecomposition of the resultant mixture

2CO + O2 2CO2

Q.5 A) State one chemical test to differenti-ate between the followingi) sodium carbonate and sodium sulphiteii) Ferrous nitrate and lead(II) nitrate

B) Draw electron dot diagram to show theformation of the ion formed when ammoniais added to water

C) A solution P has pH 13, Q has pH 6 andsolution K has pH 2:i) Which solution will liberate ammonia gasfrom ammonium sulphate on heating.ii) Which solution will liberate hydrogen onreacting with zinc.iii) Which solution contains unionized mole-cules as well as ions.iv) Which solution will turn phenolph-thalein solution pink.

Q.6 A) Explain the following:1) In electroplating an article with silver,Silver nitrate solution is not preferred as theelectrolyte.2) In concentration of the Bauxite ore conc.Sodium hydroxide is used instead of anyacid.3) Hydrogen chloride gas is not collected bydownward displacement of water.4) Conc,sulphuric acid is not used as a dry-ing agent for ammonia.

B) Name the following:i) The alloy containing equal proportions oftin and lead.ii) The alcohol used for industrial purpose.iii) The anion that is detected by brown ringtestiv) The gas liberated when dilute nitric acidreacts with calcium carbonate.

C) Give electron dot diagram to show forma-tion of Magnesium chloride.[Atomic Number Mg=12 CI=17]

06 “To achieve what 1% of the world’s populationhas, you must be willing to do what only

1% dares to do. ” – Manoj Arora PRACTICE PAPERS

PRACTICE PAPERCHEMISTRY

CLASS X, ICSE

GENERAL INSTRUCTIONS1) Answers to this paper must be written onthe paper provided separately.

2) You will not be allowed to write in the first 15 min.

3) This time is to be spent in reading theQuestion paper.

4) The time given at the head of the paper isthe time allotted for writing the answers.

5) SECTION I is compulsory. Attempt any fourquestions from SECTION II.

These questions and the marks alongside aremeant for practice purpose only. Studentsare advised to check format, syllabus and

marks for Board test papers with theirteachers. Questions have been given by

teachers and NIE is not responsible for them.

GET BETTER AT BALANCING EQUATIONSGET BETTER AT BALANCING EQUATIONSGET BETTER AT BALANCING EQUATIONSMadhavi Mittapalli, HOD-Chemistry, Gitanjali Senior School, Hyderabad presents a Chemistry paper for you to practice...

Name ofthe process

Ostwald'sprocess

Haber'sprocess

Nitrogenand

hydrogenAmmonia

platinum

Inputs catalyst

Balancedchemical

equation forthe catalyzed

reaction

Outputproduct

S tress is a common emotion we expe-rience when we come across the wordexams. Exam stress can begin when

you feel you can't cope with the burden ofrevision or feel pressured by your schoolor family. But bottling up stress and tryingto deal with it on your own canoften make it worse.

Identify exam stress

Some signs of stressinclude a state of con-fusion, mood swings,lack of motivation,fidgeting, nail bitingand teeth grindingetc. Once stress isidentified, you canadopt ways to re-duce and deal withit in an effective man-ner. Steps to reduce tension

Follow a well-planned routine each dayfor eating and sleeping.

Give time to your brain to recharge witha good night's sleep.

Keep rewarding yourself each time youfinish your study goals. It could bewatching a favourite TV show or goingfor a run.

Keep away from the mobile phone, so-

cial networking sites and all kinds ofdistractions. Just stay focused on yourgoals. Set up your study space; makesure it is free from clutter.

Avoid junk food as they give you instantenergy; you start feeling low after some

time. Have a well-

balanced dietc o m p r i s i n gfresh fruits,c e r e a l s ,grains, nuts,proteins andvegetables, forthat extraboost of ener-gy. Speak to

your teacherand get your

doubts clarified be-forehand. Mind-

maps can be a great op-tion while studying important points;you can use bright colours to help youremember important links.Remember, clearing exams is only one

part of the studies. What's important is tounderstand there is always a secondchance; another way to reach your goals.

KONIKA, school counsellor, The Gurukul,

Panchkula

Ditch exam jitters for goodBEATING STRESS

LIFE BEYOND THE COMFORT ZONE

What was the study pattern you fol-lowed for efficient use of time?I made sure I studied at least 2 to 3 hours,

with complete concentration. Iwent through the subjectstaught at school on the sameday, so that I did not face dif-ficulty in understanding themlater. Punctuality, sincerityand concentration are essen-tial traits.

Do students need to attendcoaching classes or tuitions inclass X?It's not required. One should regu-larly study and practice what istaught every day. Practice makesone perfect. I was happy studyingat home. I thank my teachers forbeing supportive and always readyto clear any of my doubts. If we have

an interest in the subject and ensureour involvement in the lessons,nothing is impossible. So, have agood attitude towards studies.

Any tips for your juniors?There are a number of apps relat-

ed to academics. Download them,take mock tests and solve questionpapers from previous years. Never

procrastinate. Always maintain aformula book for science andmaths. We are likely to forget con-

cepts if we study them only aday before the exams. So learnthe concepts well in advance and

and until you attain perfection.I am sure your exams will be acakewalk. Best of luck!

RACE TO THE TOP WITH EASES M Sutharshan Raj was the school topper in the 2018 ICSE board exams. He

comes up with tips for the current batch...

S M Sutharshan Raj

English 90

2nd Lang 96

HCG 97

Maths 100

Science 96

3rd Elective 100

Total 579

Total % 96.5

Growth is an essential part oflife. We are as good as ‘dead’when we do not grow. A per-

son who does not grow with time islike a body that is living, but isn'texperiencing the real meaning oflife. The farther we run away fromour fear, the more it's going to con-trol our life. And the harder we tryto face it and beat it, the strongerwe will become. When we set chal-lenges or goals for ourselves, weshould first try to overcome fear,self-doubt and hesitation. And whenwe are able to do all this, we are like-ly to achieve the set goals and thusexperience a feeling of self satis-faction. And this feeling of self sat-isfaction encourages us to set newgoals for ourselves and help usevolve as a better, stronger and suc-cessful person. So, step out of yourcomfort zone and help yourselfevolve as a human being. Always re-member that choices made by us to-day define our tomorrow. Please becareful in making those choices orone day, when you are old with nohopes or aspirations left, you willrealise that you had your chance tomake your life better – but you letgo of it for nothing.

HIMANI JAIN, English teacher, The

Gurukul, Sector 20, Panchkula