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ICSE Class X Board Exam 2013 : Chemistry

9 pages, 84 questions, 87 questions with responses, 666 total responses,    3    1
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CHEMISTRY SCIENCE Paper (One hour and - 2 halfl Answers to this Paper must be written on the paper provided separately. You will not ls be allowed to write during the first minutes. This time is to be spent in reading the euestion paper. The time given at the head of this paper is the time section I is compulsory. Attempt any The intended marks for questions four allowedfor writing the answers. questions from section II. or parts of questions arre given in brackets I J. SECTION I (40 Marks) Attempt oll questionsfrom this Section Question (a) 1 From the list given below, select the word(s) required to correctly complete blanks (i) to (v) in the following passage. The words from the list are to be used onlr once. write the answers as (a) (i), (ii), (iii) and so on. Do not copy the passage. [ammonia, ammonium, carbonate, carbon dioxide, hydrogen, hydronium, hydroxide, precipitate, salt, water]: ,t:'i. (i) A solution M turns blue litmus red, so it must contain (i) another solution _ions; o turns red litmus blue and hence, must contain (ii) ions. (ii) When solutions M and O are mixed together, the products -- will be (iii) and (iv) (iii) If a piece of magnesium be Tt3 @ 522 was put into a solution M, (v) evolved. This Paper consists of 9 printed pages unO f Copyright reserved. gas would t5l UlurLJrg* Turn over L (b) Identify the gas evolved in the following reactions when: (i) sodium propionate is heated with soda lime' (ii) potassium sulphite is treated with dilute hydrochloric acid. (iii) Sulphur is treated with concentrated nitric acid, . (iv) a few crystals (v) concentrated hydrochloric acid is made to react with manganese of KNos are heated in a hard glass test tube. tsl dioxide. (c) state one appropriate observation for each of the following: (i) Concentrated sulphuric acid is added drop wise to a crystal of hydrated copper sulPhate. (ii) (iii) (iv) Copper sulphide is treated with dilute'hydrochloric acid' Excess of chlorine gas is reacted with ammonia gas' A few drops of dilute hydrochloric acid are added to silver nitrate solution, followed by addition of ammonium hydroxide solution' (v) (d) Electricity is passed through molten lead bromide. t5l Give suitable chemical terms for the following: (i) A bond formed by a shared pair of electrons with both electrons coming from the same atom. (ii) (iii) (iv) (v) A salt formed- by incomplete neutralisation of an acid by a base. A reaction in which hydrogen of an alkane is replaced by a halogen. A definite number of water molecules bound to some salts. The process in which a substance absorbs moisture from the atmospheric air to become moist, and ultimately dissolves in the absorbed (e) t5] Give a chemical test to distinguish between the following pairs of compounds: (i) (ii) (iii) (iv) (v) Tt3 water' 522 Sodium chloride solution and sodium nitrate solution' Hydrogen chloride gas and hydrogen sulphide gas' Ethene gas and ethane gas. Calcium nitrate solution and zinc nitrate solution. Carbon dioxide gas and sulphur dioxide gas. tsl (0 choose the most appropriate answer from the following options: (i) Among the period 2 elements, the element which has high electron affinity is (A) Lithium (B) (C) (D) (ii) Ammonia Ammonium chloride Sodium hydroxide Calcium chloride. They are hydrocarbons. There is a single covarent bond between carbon and hydrogen They can undergo both substitution as well as addition reactions on comprete combustion they produce carbon dioxide and water. Which of these will act as a non_electrolyte? (A) (B) (C) (D) (v) Fluorine Identify the statement that is incorrect about arkanes: (A) (B) (c) (D) (iv) Chlorine Among the following compounds identify the compound that has all three bonds (ionic. covalent and coordinate bond). (A) (B) (C) (D) (iii) Carbon Liquid carbon tetrachloride Acetic acid Sodium hydroxide aqueous solution acid Potassium chloride aqueous solution. which one of the following will not produce an acid when made to react with water? (A) (B) (C) (D) (vi) Carbon monoxide Carbon dioxide Nitrogen dioxide Sulphur trioxide. Identify the metailic oxide which is amphoteric in nature: (A) Calcium oxide B) Barium oxide Tt3 522 Turn over (C) (D) (vii) Zinc oxide Copper(Il)oxide. In the given equation identify the role played by concentrated sulphuric acid s + 2HzSO+ -+ (A) (B) (C) (D) 3SO2 + ZHzO: Non-volatile acid Oxidising agent DehYdrating agent None of the above. (viii) Nitrogen gas can be obtained by heating: (A) (B) (C) (D) (ix) Magnesium nitride. Ammonium chloride. High melting Point. Conducts electricity in the molten and in the aqueous solution state. They are insoluble in water. They exist as oppositely charged ions even in the solid state. The metals zinc and tin are present in the alloy: (A) (B) (C) (D) (e) Ammonium nitrite. Which of the following is not a typical property of an ionic compound? (A) (B) (C) (D) (x) Ammonium nitrate. Solder. Brass. Bronze. lt0l Duralumin. Solve the following: (D What volume of oxygen is required to burn completely 90 dm3 of butane under similar conditions of temperature and pressure? ZeqOrc+ (ii) l3oz The vapour density of a gas is 24.0 gof the gas at STP? Tt3 522 8co2 + l0H2o 8. l2l What would be the volume occupied by 121 (iii) A vesser contains X number of morecures of hydrogen gas at a certain temperature and pressure. How many morecures of nitrogen gas wourd be present in the same vesser under the same conditions of temperature and pressure? tU SECTION If (40 Marks) Attempt anyfour questionsfrom this Section Question 2 (a) Group IA IIA IIIA IVA VA number VIA I VIIA 0 2 I3 t4 I5 16 l7 r8 2no period Li D A E R o o o Mg T I o H Si a J M Ne u v In this table H does not represent hydrogen Some erements are given in their own symbor and position in the periodic tabre. While others are shown with a letter. With reference to the table answer the following questions: (i) Identifu the most electronegative (ii) (iii) (iv) (v) (vi) element. Identify the most reactive element of group l. Identify the erement from period 3 with reast atomic How many valence electrons are present in which erement from group 2 wourd have the reast ionization Identify the noble gas of the fourth period. (vii) In the compound between A and H what type of bond wourd be formed and give the molecular formula for the same. (b) compare the compounds carbon tetrachroride and sodium chroride with regard to solubility in water and electrical conductivity. size. ..*' e? energy? ttl tll tl] tlI trl llI tzl I2t Tt3 522 Turn over Question 3 (a)Choosingthesubstancesfromthelistgivenbelow,writebalancedchemical equationsforthereactionswhichwouldbeusedinthelaboratorytoobtainthe following salts: Copper(Il) carbonate Sodium carbonate Sodium chloride Copper Dilute SulPhuric acid Iron Sodium Z\nc rritrate (D (ii) (iiD (iv) Sodium sulPhate Zinc carbonate CoPPer(II) sulPhate for each of the State two relevant observations (b) t4l Iron(II) sulPhate' following: (i)Ammoniumhydroxidesolutionisaddedtocopper(tI)nitratesolutionin excess' small quantities and then in (iDAmmoniumhydroxidesolutionisaddedtozincnitratesolutionin (iii) in excess' minimum quantities and then in a hard glass test tube' Lead nitrate crystals are heated t6l Question 4 (a) electrodes' electrolysed using copper Copper sulphate solrttion is follows: and answer the question that Study the diagram given below coppei(t t) sulPhate solution (i) electrode or right is known as the oxidising Which electrode to your left and whY? Tr3 522 121 (ii) (iii) write the equation representing the reaction that occurs. tll State two appropriate observations for the above erectrorysis reaction. Normal Electronic 2,8,7 Nature of oxide Dissolves in watei and turns blue litmus red Tendency for oxidising and reducing reactions Tends to oxidise elements and Electrical and Thermai conductivin Very poor electrical conductor Poor thermal conductivi No tendency to fo.m Tendency to form t2l Very low solubilffi water. Dissolves in hydrochloric acid, Tends to act as a reducing agent Good Electrical conductor Good Thermal conductor Forms alloys Using the information above, complete the following: (ii) Metal atoms tend to have a maximum of outermost energy level. (iii) (iv) Non-metallic elements tend to form to form oxides. Non-metallic elements tend to be electricity. electrons in the oxides while metals tend conductors of heat and (v) their reactions with elements and compounds. agents in lsl Question 5 (a) Give balanced equations for each of the following: (i) Reduction of hor copper(rl) oxide to copper using ammonia gas. (ii) Oxidation of carbon with concentrated nitric acid. (iii) Dehydration of concentrated surphuric acid with sugar crystars t3l T13 s22 Turn over (b) Copy and complete the following table relating to important industrial process: Name of the process Temperature Equation for the Catalyst catalyzed reaction Haber's process t3l (c) The following questions relate to the extraction of aluminium by electrolysis: (i) Name the other aluminium containing compound added to alumina and state its significance. (ii) (iii) Give the equation for the reaction that takes place at the cathode. Explain why is it necessary to renew the anode periodically. t4l Question 6 (a) Give balanced equations for the laboratory preparations of the following organic compounds: (i) (ii) (iii) (iv) (b) An unsaturated hydrocarbon from calcium carbide' An alcohol from ethyl bromide' t4l An isomer of n-butane. 2-propanol. Diethyl ether. t3l Give reasons for the following: (i) (ii) (iii) Tt3 An unsaturated hydrocarbon from an alcohol' Give the structural formulae for the following: (i) (ii) (iii) (c) A saturated hydrocarbon from iodomethane' 522 Methane does not undergo addition reactions, but ethene does. Ethyne is more reactive than ethane' Hydrocarbons are excellent fuels. t3l Question 7 (a) 02 is evolved by heating KCro3 using Mno2 as a cataryst utto: 2KCIO3 ) 2KCl + 3.., (i) Calculate the mass of KCI03 required to produce 6.72litreof oz at STp. [atomic masses of 39, Cl:35.5, O: K: (ii) (iii) (b) 16] carculate the number of nores of oxygen present in the above vorume and also the number of molecules. calculate the vorume occupied by 0.01 mole of coz at Identiff the followinr rrur,ur..s which are underrined: (i) An alkaline gas which produces dense white fumes srp. pl pt tll when reacted with hydmgen chloride gas. (ii) (iii) An rcid which is present in vinegar. A sas which does not conduct electricity in the liquid state but conducts electricity when dissolved in water. (iv) A dilute mineral acid which forms a white precipitate when treated with barium chloride solution. (v) Tt3 522 The element which has the highest ionization potentiar. tsl

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