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ICSE Class X Prelims 2018 : Chemistry (Bishop Cotton Girls School (BCGS), Bangalore)

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Ruby Peter
Bishop Cotton Girls' School (BCGS), Bangalore

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f\i 'l I tl -.1 !{tr:,u: N,{*tsFrop coroN GT RLS' SCHOOL, BANGALORE s ECo t\ D TE R l\4 EXAN4 I tlATr o N - N ovE M B ER./D EC E r\4 B E R 2 0 L7 CHEMISTRY STD:X MARKS:80 DAfE:07.12"17 TIME :2 Hrs Answer to this poper must be written on the poper provided seoaratellr. You will not be oilowed to write during the first 15 minutes, This time is to be spent in reaciing the euestion paper" The time given at the heod of this poper is the time ollowed for writing the answrers. section I is compulsorr-. Attempt ony four questians from sectian r!. TheintertciedrnarksforquestionsorpartsofquesticnsotegiveninbrockersIi. sEcTtoN -t (Answer all the questions) QUESTION 1: a) Select the correct answer from the choices given : [10] 1,. Which one of the following is the most reactive? A" Fluorine B. Chlorine C" Bromine D. todine 2. Which one is the polar covalent molecule? A. KCI B. 3" NaCl C. CCt4 D, HCI sometimes chlorine gas is passed through water for its purification.what will be the pH of such a sample? A. Equalto 7 B. More than 7 C. lessthan 7 D. very nearto g 4" The aqueous solution of which one of the following salts will be acidic? A. NaHCO3 B. NaCl C. NH4CI D. CH3COONa 5. A knife is to be electroplated with nickel.The electrolyte selected is A' Nickel nitrate B. Nickelsulphate c, Nickelammonium sulphate D. Nickel bromide 6. But-L-ene and But-2-ene are examples of one of the following isomerism A' Chain isomerism B. position isomerism C. functional isomerism D" Geometric isomerism 7. The nitrate salt which does not give a mixture N02 and 02 on heating is A. AgN03 B. KNOs C. Cu(NO:)z D. Zn(NOg)z 8. 9' which one of the foilowing has rarger number of morecures? B" 12gofO2 C.2gofH2 D. 2LgofN2 which one of the foilowing has the smailest atomic radius? A" Lithium B. Fluorine C. potasium D. Chlorine A. 11gofCO2 10. The property which is characteristic of an electrovalent compound is that: A. lt easily vaporizes B. lt has a high melting point C, lt is a vueak electrolyte D. lt often exists as a liquid b) Filt in the blanks from the choices given L. 2. 3" rql LJ) ethanoate, sodium ethoxide, sodium propanoate) The ions in electrovalent compounds are held very strongl\i due to strong (Electromagnetic, electrostatic,vander walls ) forces. acid salt,basic salt, normal Ca(HzPOq)z is an example of a compound called It) lrnn/lll) rhlnrida hrr. ic ,J nroneranl vy, P,!F,q,rs I Anhrrnlrn,rc rarrrrys' 5. (Simple displacement, decomposition, direct combination) The particles present in strong electrolytes are (only mels6ules, mainly ions, ions and molecules) : State your ohsenvatiol'ls: L. 2. 3. 4. 5. d) : The compound formed when ethanol reacts with sodium is ----------------- ( Sodium sa c) within brackets tr'l LJl tr Addition of ethyl alcohcl to ethano!c aciC in the presence crf ccncentrateC suiphuric acid Chlorine is passed through starch lodide paper When ammonia gas is passed through neutral litmus At the anode when molten lead bromide is electrolysed The colour imparted to the flame when calcium salt is introduced into it. Give balanced chenrical equations for the following neactions: tsl 1-. Preparation of ethyne from 7,2 -dibromoethane 2. Decomposition of a metallic nitrate by conc" Sulphuric acid 3" Zinc oxide dissolves in NaOH 4" Reaction of cold water with calcium carbide 5. e) Manganese dioxide is added to eonc.hydrochloric acid Give the structural formula of the following Is] 1.3- methyl pentane 2.Propanone 3, Butanal 4. !,7,2,2 tetra broms ethane 5.Ethanoic acid f) Solve the following: of oxygen is required to burn comptetely 90dm3 of butane under similar Conditions of temperature and pressure? 2CaH1s+ 1302) 8CO2 + 10 HzO l-. What volume l2l 2. The vapour density of a gas is B.What would be the volume occupied by 24 g of the gas at STP. lzl 3. Calculate the volume of 2.5 moles of a gas X at stp. g) Explain the bonding in methane using electron dot t1l structure t3l h) What is coordinate bond? Show the formation of coordinate covalency using hydronium ion . [21 SECTION E (Answer anv FOUR questions onlvl QUESTIOIT 2 L. what type of reaction tal<es place between ethane and chlorine to form monochloroethane? i1l Z. The reaction between ethene and chlorine forms only one product. Name the product.[1] 3. Drawthe structural formula of 4. What is the feature of the ethene structure vrhich allows ethene tc react vuith chloi-ine the way it 5. ethene. does? t1l tll The list of some organic compounds are given beiow; Ethanol,ethane,methanol,methane,ethyne and ethene.From the list ,name the compound: i) Formed by dehydration of ethanol by conc.H2SOa. ii) Which will give red precipitate with ammoniacal cuprous chloride solution? iii) Which forms methanoic acid on oxidation in the presence of copper at 2000C? iv) Which has vapour density L4 and turn alkaline potassium permanganate green v) Which forms chloroform on halogenation in the presence of sunlight? vi) which decolourises bromine solution in carbontetrachroride quEsTtoN 3 1-" From the equation C : + 2H2SO4) CO2 + 2H2O + 2SOz Calculate i) The mass of Carbon oxidized by 49 gm of Sulphuric acid. 16l ii) The volume of SOz measured at s.t.p Ii.berateo at the same time (C = !2, relatlve molecular mass of H2SOa = 93; i ii) I4l ? The mass of 5.6 dm'of a gas ats.t.p is 1-2 gm.Caiculate the relative molecular mass of the gas. 2. Define i) lonisation potential ii) Electron affinity How cjo they vary in group i7 anci perioci 3 QUESTION 4 i,. During electrolysis of copper(ll) Sulphate solution using platinurn as cathode and carbon as ot tuuE h^.{^ ^ 2. i) What cio you observe at the cathode and at the anode? iii What change is noticed in the eiectroiyte? iii) Write the reaetions at the cathode and the anode, t5l Draw a Iabelled diagram and write the reactions at the electrodes in the electroplating a QUESTTON s equation for the reaction in each case i) ln the production of HCI gas when it reacts with a chloride ii) ln the preparation of CO from HCOOH iii) As a source of hydrogen by diluting it and adding a strip iv) ln the preparation of sulphur dioxide by warming the mixture of conc.sulphuric acid of magnesium and copper turnings v) Hydrogen sulphide gas is passed through conc.sulphuric Give a chemical test to distinguish between the following acid tsl 3" i) Ferric salt and Ferrous salt ii) Zinc and lead salt l4l What is glacial acetic acicj? i1l quEsTIoN 6 1,' M2O is the oxide of a metal 'M'which is above hydrogen in the acitivity series. tr42O when dissolved in water forms the corresponding hydroxide which is a good conductor of eiectricity. 2' i) State the reaction taking place at the cathode ii) Name the product at the anode pl Eiement X is a n'letal with the valency 2. Element Y is a non-metalwith the valency i) Write equations to show how X and y form ions, ii) if Y is a diatomic gas, write the equation for the cjirect combination of X and y to form a compound 3. Draw the structuralformulae each 4. 3 of the two t3I isomers of Butane, Give the correct IUpAC name of isomer i4l Ethyne, State one use of I1l QUESTION 7 1. Match the saltsgiven in column I with thelr preparation given in column il Column I 6olumn ll i) Pb(NO3)2 ii) MgCl2 iii) FeCl3 iv) NaNO3 v) a) Simple displacement b) Titration c) Neutralization from NaOH d) Precipitation ZnCO'. from ZnSOa e) Comb!nation from PbO from Mg from Fe tsI A compouno is found to possess C= 4a%a, H =6.7% and Find the nrolecular formula of the compound? ( c o = 53.3 = 12, H = 1, c oz'0" = tts nrolecular mass is 60. r-6) calculate the percentage of phosphorous in carcium phosphate ca3(pcra)2 t4l

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Additional Info : ICSE Class X Mid-term 2018 : Chemistry

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