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ICSE Chemistry Mock Paper 3, The Heritage School

7 pages, 92 questions, 41 questions with responses, 41 total responses,

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The Heritage School Second Terin Examinat ion 2OL3-L4 CIass-X CHEMISTRY Time-2 hours Full marks-80 (Candidates are allowed additional L5 minutes for only reading the paper.They must NOT start writing during this time) Answer all questions in Section I & any four from Section Il. All working, including rough work, should be done on the same sheet and adjacent to, the rest of the answer. The intended marks for questions or parts of questions are given in brackets[]. Balanced equations must be given wherever possible and diagrams where they are helpful. Section I (Answer all questions) Question 1 (a) Choose from the following list of substances, as to what matches the descriptions from (i) to (v) given below: [Ethyne, Platinum, lead hydroxide, Ethane, vanadium pentoxide, calcium oxide, calcium carbonatel (i) A compound whose aqueous solution is neutral in nature. (ii) A compound which is insoluble in water but soluble in ammonium hydroxide. (iii) The catalyst conveniently used in the manufacture of sulphuric acid by contact process. (iv) A solid used for drying moist ammonia. (v) A gaseous hydrocarbon which cannot decolourise bromine water. (b) What would you observe in the following cases? (i) Sugar crystals are shaken with conc. Sulphuric acid. This paper coisists of 7 pages t5l (ii) Acetic acid is added to calcium bicarbonate. (iii) Dilute hydrochloric acid is added to sodium thiosulphate solution. (iv) Ammonia is passed through iron(ll) sulphate solution. (v) Conc. nitric acid is strongly heated. tsl (c) Choose the correct answer from the choices A,B,C and D given below' (i) ln aquaregia conc hydrochloric acid acts as (A) Oxidising agent (B) Volatile acid (C) Reducing agent (D) Strong acid (ii) ln periodic table elements in all the three states are placed in the group(A) 2 (B) 12 (c) 18 (D) 17 (iii) The saturated hydrocarbons undergo (A) Substitution reaction (B) Neutralisation reaction (C) Addition reaction (D) None of these (iv) Which of the following properties does not match with the alkali metal elements? (A) They are highly reactive (B) They are diatomic (C) They have low lonisation Potential (D) They have one electron in their valence shell. (v) The brown ring test is used for detection (A) Co3- (B) N'- (C) NO2- (D) NO3- of (vi)The number of C-H bonds in but-2-yne molecule is (A) s (B) 6 (c) 7 (D) 8 (vii)The substance which liberates reddish brown gas around the anode during electrolysis is (A) Aqueous lead (ll) bromide (g) Molten sodium chloride (C) Aqueous copper (ll) nitrate solution. (D) Molten lead (ll) bromide (viii)The organic compound mixed with ethanol to make it spurious is (A) Methanol (B) Methanoic acid (C) Methanol (D) None of these (ix) Orange tastes sour. lts pH value will be (A) 7 (B) Greaterthan 7 (C) Lessthan 7 (D) Cannot be predicted. (x) The molecular mass of the third homologue of alkene is (A) s8 (B) s6 (c) s4 (D) None of these [10] (d) Give reasons for the following: / (i) Majority of the known compounds are organic compounds. (ii) lt is dangerous to burn acetylene in an insufficient supply of air. (iii) Magnesium oxide is less basic than sodium oxide. (iv) Liquid hydrogen chloride is non conductor of electricity but hydrochloric acid conducts electricity easily. (v) Conc. hydrochloric acid cannot used in place of conc sulphuric acid during t5l preparation of nitric acid in the laboratory. (e) Write the balanced chemical equation for each of the following reactions. (i) Zinc hydroxide is strongly heated. (ii) Sulphur is boiled with conc. sulphuric acid. (iii) Ammonia is treated with excess chlorine. (iv) Calcium sulphite is treated with dil HCl. (v) Copper nitrate is strongly heated. tsl (f) Catalytic oxidation of ammonia to nitric oxide takes place according to the following chemica leq uation. 4NO+6H2O 4NHr+5Oz * lf 112m1 of ammonia at s.t.p. is used in the above reaction, calculate the following: (i) Number of moles of ammonia used in the given reaction. (ii) Mass of oxygen involved in the reaction. (iii) Volume of nitric oxide produced at s.t.p. (iv) Number of water molecules formed in the reaction. (v) Which law is supported in the above reaction if all the reactants and products are gaseous at same temperature and pressure. Give reason. IsI (g) Match the items of column A with items of column B Column B Column A (i) Propanone (ii) Acetaldehyde (iii) Propanoic acid (iv) rthyl alcohol (v) Propyne Hydroxyl grouP Carboxyl grouP Unsaturated hydrocarbon Aldehydic grouP Ketonic grouP tsl Section ll (40 marks) Attempt any four questions from this Section Question 2 (a) Solutions X,Y,Z have pH values 1.,!4 and 7 respectively' Answer the following questions. (i) Which solution will liberate carbon dioxide when heated with a bicarbonate salt? (ii) Which solution will liberate ammonia gas when boiled with ammonium sulphate. (iii) Which solution will you use to dilute a concentrated solution? (iv) Equal volume of water is added to each X,Y and Z separately. How will the pH values change (increase, decrease or remain same) in each case? Give t6l reason for your answer. (b) Complete the following conversions and give balanced equation. copper(ll)carbonate A, copper(ll)nitrate B, copper(ll)hydroxide IC i Copper(ll)sulphate {-D Coooer(ll)oxide Question 3 (a) How will you carry out the following conversions? (i) Ethene to Ethanol l4l (ii) Sodium propanoate to Ethane (iii) Ethanol to Ethene (iv) Methane to Chloroform (v) Calcium carbide to Acetylene tsl (b) What type of bonds are present in the following species? (i) Po (ii) Cao (iiii) H30. 121 (c) With reference to a molecule of ammonia, fill in the blanks with correct word from bracketl] lnammoniamoleculetheatomof-[hydrogen/nitrogen]attracts the bonded electron pairs more strongly towards itself. Ammonia molecule shows the presence of ltriple/double/three single] covalent bonds and I3l [one/two/no] lone pair(s) of electrons. Question 4 (a) An organic compound with vapour density=94 contain s C=1,2.67Yo, H=2.13%o and Br=85 .1,1%. Find the molecular formula of the compound. t3l (b) Sample of impure magnesium is reacted with excess dil sulphuric acid to give the respective salt and hydrogen. lf 19 of the impure sample gave 336m1 of hydrogen at s.t.p.Calculate lhe% purity of the sample.[Me=24][3] (c) Write the structural formula of the following compounds. (i) 2,2-dimethyl pro pa ne (ii) But-1-yne 121 (d) Write the l.U.P.A.C. names of the following: (i) (cH3)3.c.oH (ii) cH3.co.czHs Question 5 (a) ln connection with the preparation of ammonia in the laboratory,answer the following questions: (i) Names of the reactants. 12) (ii) Reaction conditions (iii) Balanced chemical equation for the preparation of ammonia in the laboratory. (iv) How is the gas collected? (v) How is the gas identified chemically? lsl (b) How will you prepare the foilowing: Give necessary chemical equations (i) A volatile acid from a non volatile acid. (ii) A normal salt from an acid satt. (iii) Nitrogen from ammonia. (iv) Ethane from Ethyne (v) Sulphuric acid from surphur trioxide in contact process. lsl Question 5 (a) ln connection with erectrorefining of copper answer the foilowing: (i) The names of the cathode and the anode. (ii) The electrolyte used. (iii) Reaction occurring at cathode. (iv) Reaction occurring at anode. (v) Visible change observed during electrolysis. lsl (b) Give a chemical test to distinguish between the following pairs of compounds. (i) Dilute hydrochroric acid and dilute surphuric acid. (ii) Zinc nitrate and tead nitrate. t2l (c) ldentify the underlined substance and write balanced chemical equation. (i) A sweet smetling substance obtained when ethanot is heated with acetic acid in presence of conc H2SO4. (ii) A colourless substance is obtained when propene is bubbred through bromine water. (d) What is glaciat acetic acid? tzl t1l Question 7 (a) Elements Atomic Number X 11" Y 7 Z 2 D 9 E t7 Study the above table and answer the following questions. (i) ldentify the most electronegative element. (ii) Which element cannot form bond of any kind with any of the remaining elements? (iii) Write Lewis electron dot structure of the molecule containing Y. (iv) ldentify the element with largest atomic size. (v) ldentify the element with highest electron affinity. t5l (b) Account for the following: (i) When silver nitrate solution is separately added to each of sodium chloride sotution and carbon tetrachloride, a curdy white ppt is obtained in case of sodium chloride only. (ii) Acetic acid is a weak electrolyte whereas dil sulphuric acid is a strong electrolyte (iii) During manufacture of sulphuric acid by contact process heating in the catalytic chamber is stopped after the start of the reaction. t3] (c) Show by calculation which of the following compounds contains higher percentage (by mass) of nitrogen assuming the compounds to be cent percent pure. (i) Ammonium nitrate (ii) Ammonium sulphate N=14, S=32, O=15 l2l

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