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ICSE Class X Prelims 2023 : Chemistry (Karnataka ICSE Schools Association KISA, Bengaluru)

6 pages, 38 questions, 38 questions with responses, 62 total responses,

Aditya ghosh
Ryan International School (RIS), Kundalahalli, Bangalore

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1 KARNATAKA ICSE SCHOOLS ASSOCIATION Std. X - PREPARATORY EXAMINATION 2023 SUBJECT : CHEMISTRY ------------------------------------------------------------------------------------------------------------Maximum Marks : 80 Time : 2 hours Answers to this paper must be written on the answer sheet provided separately. Attempt all questions from Section A and any four questions from Section B. All working, including rough work, must be clearly shown and must be done on the same sheet as the rest of the answer. Omission of essential working will result in the loss of marks. The intended marks for questions or parts of questions are given in brackets [ ]. ------------------------------------------------------------------------------------------------------------- SECTION A (40 marks) (Attempt all questions from this section) Question 1. Choose the correct answer from the options given below: [15] (i) Elements belonging to the same group have similar chemical properties, because a) they have similar electronic configuration in valence shell. b) their atomic numbers increase as we move down a group c) they are all metallic or nonmetallic elements. d) their number of electrons increase steadily. (ii) A salt which in solution gives a bluish white precipitate with NaOH solution and a white precipitate with BaCl2 solution is: a) CuCl2 b) FeSO4 c) CuSO4 d) Fe2(SO4)3 (iii) During the electrolysis of acidified water using inert electrode, which of the following takes place: a) Oxygen is released at Cathode b) Oxygen is released at anode c) Hydrogen is released at anode d) Sulphur dioxide is released at anode. (iv) Formation of chloroform from methane and chlorine is an example of: a) Addition b) Dehydration c) Substitution d) Elimination 2 (v) The element with the highest ionization potential in the periodic table is: a) He b) Ne c) Ar d) Xe (vi) Which of the following is a common characteristic of a covalent compound? a) High melting point. b) Conducts electricity when it is in the molten state c) Consists of molecules d) Always soluble in water. (vii) Hydroxide of this metal is soluble in sodium hydroxide solution. a) Magnesium b) Lead c) Silver d) Copper (viii) An element in period-3 whose electron affinity is zero. a) Neon b) Sulphur c) Sodium d) Argon (ix) Which of the following metallic oxides cannot be reduced by normal reducing agents? a) Magnesium oxide b) Copper (II) oxide c) Zinc oxide d) Iron (III) oxide (x) Identify the weak electrolyte from the following: a) Sodium chloride solution b) Aqueous acetic acid c) Dilute Hydrochloric acid d) Dilute Sulphuric acid (xi) Coke (carbon) on heating with concentrated. Nitric acid: a) Does not react b) Reacts to form water and carbon dioxide c) Reacts to form water, nitrogen dioxide and carbon dioxide d) Reacts to form water and nitrogen dioxide (xii) Which of the following forms neutral solution in water? a) K2SO4 b) (NH4)2SO4 c) Na2CO3 d) Cu(NO3)2 (xiii) The basicity of ethanoic acid is: a) 4 b) 2 c) 1 d) 3 3 (xiv) Stainless steel is an alloy of: a) Fe and Cr b) Fe and Ni c) Fe, Cr and Ni d) Al, Fe, Co and Ni (xv) During the electrolysis of copper sulphate solution using copper electrodes, the mass of anode gradually: a) Increases b) Decreases c) Remains same d) None of these. Question 2: (i) The diagram given below illustrates the apparatus used in the laboratory preparation of nitric acid. [5] a) Name A (a liquid), B (a solid) and C (a liquid) (Do not give the formulae) b) Write an equation to show how nitric acid undergoes decomposition c) Write the equation for the reaction in which copper is oxidized by concentrated nitric acid. (ii) Match the following column A with column B a) b) c) d) e) (iii) Column A Sodium chloride Ammonium ion Electronegativity across the period Nonmetallic character down the group Carbon tetra chloride [5] Column B Increases Covalent bond Ionic bond Covalent and coordinate bond Decreases Complete the following by choosing the correct answers from the bracket: [5] a) The metal plate through which electric current enters in an electrolyte is called ______________ (anode/cathode) 4 b) The ions which discharge on negative electrode during electrolysis ________ electrons (lose/gain) c) A volatile acid obtained when common salt is heated with concentrated sulphuric acid is (nitric acid/hydrochloric acid) d) Excess of ammonia reduces chlorine to ____________ (NH4Cl/N2) e) Addition of __________ ( iron (III) sulphide/ iron (II) sulphide) to dilute hydrochloric acid results in the liberation of hydrogen sulphide gas. (iv) Identify the following: [5] a) An acid which furnishes 3 hydronium ions per molecule on ionization. b) A water soluble base, which furnishes hydroxyl ions. c) The gas that burns in oxygen with a green flame. d) The acid which produces sugar charcoal from sugar. e) A hydrocarbon which contributes towards the greenhouse effect. (v) Draw the structural formula for the following: 1. Propanal 2. Ethanoic acid 3. 2-methyl butane 4. 2-pentyne 5. 1,2 dichloro ethane [5] SECTION-B (Attempt any four questions) Question 3 (i) Mr. Ramu wants to electroplate his key chain with nickel to prevent rusting. For this electroplating: [5] a) Name the electrolyte b) Name the cathode c) Name the anode d) Give the reaction at the cathode e) Give the reaction at the anode The questions below are related to the manufacture of ammonia. [5] a) Name the process b) In what ratio must the reactants be taken? c) Name the catalyst used. d) Give the equation for the manufacture of ammonia e) Ammonia can act as a reducing agent-write a relevant equation for such a reaction. (ii) Question 4 (i) Name the following metals: a) A metal present in cryolite other than sodium b) A metal which is unaffected by dilute or concentrated acids. c) A metal present in period 3, group 2 of the periodic table. [3] 5 (ii) (iii) The following questions are relevant to the extraction of Aluminum: [4] a) State the reason for the addition of caustic alkali to bauxite ore during purification of bauxite. b) Give a balanced equation for the above reaction. c) Along with cryolite and alumina, another substance is added to the electrolyte mixture. Name the substance and give one reason for the addition. State one chemical test between each of the following pairs: [3] a) Sodium carbonate and sodium sulphite. b) Ferrous nitrate and lead nitrate. c) Manganese dioxide and Copper(II) oxide. Question 5 (i) (ii) (iii) (iv) What do you understand by the term empirical formula? A gaseous hydrocarbon of vapour density 29, contains 82.76% of Carbon. Calculate its empirical formula and molecular formula. [C=12, H=1] Draw different isomers having the following molecular formula: a) C5H12 (chain) b) C4H8 (position) Define the term Catenation. [1] [3] [5] [1] Question 6 (i) (ii) (iii) a) b) c) d) With the help of equations, give an outline for the manufacture of sulphuric acid by the contact process. [4] What property of sulphuric acid is shown by the reaction of concentrated sulphuric acid when heated with [2] a) Potassium nitrate b) Carbon Write balanced equations for the following reactions: [4] Dilute nitric acid and copper metal Ammonia and oxygen in the presence of a catalyst. Zinc sulphide and Dilute sulphuric acid. Silver nitrate solution and hydrochloric acid. Question 7 (i) (a) Name the process by which ethane is obtained from ethene. [2] (b)Identify the gas evolved when sodium propionate is heated with soda lime. (ii) There are three elements E, F and G with atomic numbers 19,8 and 17 respectively. (a) Classify the elements as metals and non-metals. [5] (b) Give the molecular formula of the compound formed between E and G and state the type of chemical bond in this compound. 6 (iii) Give reasons for the following: [3] (a) Hydrogen chloride gas cannot be dried over quick lime. (b) Ionization potential of the element increases across a period. (c) An aqueous solution of sodium chloride conducts electricity. Question 8 (i) What is observed when: [3] (a) Sodium hydroxide solution is added first in small amount and then in excess in Zinc sulphate solution? (b) Ethane gas is passed through a solution of bromine in carbon tetrachloride? (c) Carbon dioxide gas is passed through calcium hydroxide solution for little time. (ii) (a) State Gay-Lussac s law. [2] (b)What volume of oxygen would be required for the complete combustion of 100 litres of ethane according to the following equation: [2] 2C2H6 +7 O2 ---------- 4CO2 + 6H2O (a) Explain the following terms: [3] 1. Homologous series. 2. Ore. 3. Atomic radius. (iii) -------------------------------------------------------------------------------------------------------------

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Additional Info : ICSE Class X Sample / Model Paper 2024 : Chemistry
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