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ICSE Class X Board Exam 2025 : Chemistry

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Mahir Shah
R. B. K. School (RBK), Mira Road

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CHEMISTRY (SCIENCE PAPER 2) Maximum Marks: 80 Time allowed: Two hours 1. Answers to this Paper must be written on the paper provided separately. 2. You will not be allowed to write during first 15 minutes. 3. This time is to be spent in reading the question paper. 4. The time given at the head of this Paper is the time allowed for writing the answers. 5. Section A is compulsory. Attempt any four questions from Section B. 6. The intended marks for questions or parts of questions are given in brackets [ ]. Instruction for the Supervising Examiner Kindly read aloud the Instructions given above to all the candidates present in the Examination Hall. T25 522 Copyright reserved. This paper consists of 16 printed pages. Turn Over SECTION A (40 Marks) (Attempt all questions from this Section.) Question 1 Choose the correct answers to the questions from the given options. (Do not copy the questions, write the correct answers only.) (i) (ii) (iii) Which gas decolourises potassium permanganate (KMnO4) solution? (a) Sulphur dioxide (b) Ammonia (c) Hydrogen chloride (d) Carbon dioxide Which formula represents a saturated hydrocarbon? (a) C4H8 (b) C5H12 (c) C4H6 (d) C5H10 The metal whose oxide can be reduced by common reducing agents: (a) Copper (b) Sodium (c) Aluminium (d) Potassium T25 522 2 [15] (iv) An organic compound has a vapour density of 22. The molecular formula of the organic compound is: [Atomic weight: C = 12, H = 1] (v) (a) CH4 (b) C2H4 (c) C2H6 (d) C3H8 In the reaction given below sulphuric acid acts as a/an: S + 2H2SO4 3SO2 + 2H2O (vi) (a) Non-volatile acid (b) Dibasic acid (c) Oxidising agent (d) Reducing agent Assertion (A): The tendency of losing electrons increases down the Group. Reason (R): (vii) The most reactive metal is placed at the top of Group 1. (a) Both (A) and (R) are true, and (R) is the correct explanation of (A). (b) Both (A) and (R) are true, and (R) is not the correct explanation of (A). (c) (A) is true but (R) is false. (d) (A) is false but (R) is true. The ore that can be concentrated by using magnetic separation: (a) Corundum (b) Haematite (c) Calamine (d) Bauxite T25 522 3 Turn Over (viii) The diagram given below shows the bonding in the covalent molecule AB2. Which option represents the correct electronic configuration of atoms A and B before combining together to form the above molecule? (ix) A B (a) 2, 4 2, 8, 6 (b) 2, 4 2, 8, 7 (c) 2, 8 2, 8, 8 (d) 2, 6 2, 8, 7 Which of the following options has all the compounds which are members of the same homologous series? (a) CH4, C2H6, C3H8 (b) CH4, C2H6, C3H6 (c) C3H4, C3H6, C3H8 (d) C2H4, C3H6, C4H10 T25 522 4 (x) Assertion (A): In the Contact Process SO3 gas is not directly dissolved in water to obtain sulphuric acid. Reason (R): Dense fog or misty droplets of sulphuric acid are formed which is difficult to condense. (xi) (a) Both (A) and (R) are true, and (R) is the correct explanation of (A). (b) Both (A) and (R) are true, and (R) is not the correct explanation of (A). (c) (A) is true but (R) is false. (d) (A) is false but (R) is true. Given below are four ions: Cl , Li+, Al3+, K+ Identify the pair of ions which have the same electronic configuration. [Atomic number: Cl = 17, Li = 3, Al = 13, K = 19] (xii) (a) Cl & Li+ (b) Al3+ & K+ (c) Cl & K+ (d) Li+ & K+ Which pair of reactants can be best used to produce lead (II) sulphate? (a) Sulphuric acid + Lead (b) Sulphuric acid + Lead hydroxide (c) Sodium sulphate + Lead nitrate (d) Potassium sulphate + Lead oxide T25 522 5 Turn Over (xiii) Aqueous copper (II) sulphate is electrolysed using copper electrodes. Which statement about the electrolysis is not correct? (xiv) (a) An oxidation reaction occurs at the positive electrode. (b) The current is carried through the electrolyte by ions. (c) The positive electrode loses mass. (d) The number of copper (II) ions in the electrolyte decreases. X, Y & Z are three metallic atoms in successive order belonging to the same group such that atomic radii of X is the smallest. Which of the three atoms is the best reducing agent? (xv) (a) X (b) Y (c) Z (d) All three have the same reducing power. 40 cm3 of methane (CH4) is reacted with 60 cm3 of oxygen. The equation for the reaction is given below: CH4 + 2O2 CO2 + 2H2O All volumes are measured at room temperature. What is the total volume of the gases remaining at the end of the reaction? (a) 60 cm3 (b) 40 cm3 (c) 45 cm3 (d) 50 cm3 T25 522 6 Question 2 (i) A student was instructed by the teacher to prepare and collect ammonia gas in the [5] laboratory by using aluminium nitride. The student had set up the apparatus as shown in the diagram below. Study the given diagram and answer the following questions: (a) Name the substance X added through the thistle funnel by the student. (b) Write a balanced equation for the reaction occurring between Aluminium nitride and substance X. (ii) (c) Identify the substance Y. (d) State the function of Y. (e) Why could the student not collect ammonia gas at the end of the experiment? State the terms for the following: (a) [5] Undistilled alcohol containing a large amount of methanol. (b) A salt formed by the partial replacement of the hydroxyl group of a di-acidic or a tri-acidic base by an acid radical. (c) Organic compounds having the same molecular formula but different structural formula. T25 522 7 Turn Over (d) The tendency of an atom to attract the shared pair of electrons towards itself when combined in a compound. (e) The type of covalent bond in which electrons are shared unequally between the combining atoms. (iii) Complete the following sentences by choosing the correct word(s) from the [5] brackets: (a) ____________ solution forms a coloured precipitate with ammonium hydroxide which is soluble in excess of ammonium hydroxide. [Ferrous chloride / Copper nitrate] (b) Zinc blende is converted to zinc oxide by _________. [Calcination / Roasting] (c) ___________ conducts electricity by the movement of ions. [Molten iron / Molten sodium chloride] (d) The reaction that takes place at the anode during the electrolysis of aqueous Sodium argentocyanide with silver electrodes is ___________. [Ag Ag+ + e (e) Ag+ + e Ag] The salt formed when ZnO reacts with hot concentrated NaOH is ___________. [sodium zincate / zinc hydroxide] (iv) Match the Column A with Column B: [5] Column A (a) Column B N2 + 3H2 2NH3 1. Vanadium Pentoxide 4NH3 + 5O2 4NO + 6H2O 2. Nickel 3. Iron (d) 2SO2 + O2 2SO3 C2H4 + H2 C2H6 4. Concentrated Sulphuric acid (e) CuSO4.5H2O CuSO4 + 5H2O 5. Platinum (b) (c) T25 522 8 (v) (a) Draw the structural diagram for the following organic compounds: 1. 2-methyl propene 2. butanal [5] (b) Give IUPAC name for the following organic compounds: 1. 2. 3. SECTION B (40 Marks) (Attempt any four questions from this Section.) Question 3 (i) The atomic number of two atoms X and Y are 14 and 8 respectively. [2] State: (a) the period to which X belongs. (b) the formula of the compound formed between X and Y . (Do not identify X and Y) T25 522 9 Turn Over (ii) (iii) Justify the following statements: [2] (a) Anode is known as the oxidizing electrode. (b) Graphite electrodes are preferred in the electrolysis of molten lead bromide. The reaction between concentrated sulphuric acid and magnesium can be [3] represented by the equation given below: Mg + 2H2SO4 MgSO4 + 2H2O + SO2 If 60 g of magnesium is used in the reaction, calculate the following: (a) The mass of sulphuric acid needed for the reaction. (b) The volume of sulphur dioxide gas liberated at S.T.P. [Atomic weight: Mg=24, H=1, S=32, O=16 ] (iv) Give one significant observation when: (a) a solution of barium chloride is added to zinc sulphate solution. (b) lead nitrate is heated in a test tube. (c) chlorine gas is passed over moist starch iodide paper. [3] Question 4 (i) A gas cylinder can hold 150 g of hydrogen under certain conditions of temperature and pressure. If an identical cylinder with the same capacity can hold 450 g of gas G under the same conditions of temperature and pressure, find: (a) the vapour density of the gas G . (b) the molecular weight of gas G . T25 522 10 [2] (ii) (iii) (iv) Complete and balance the following equations: (a) CH3COONa + NaOH (b) CH3COOH + Mg [2] CaO Name the gas produced during each of the following reactions: (a) When copper is treated with hot, concentrated nitric acid. (b) When ammonia is burnt in an atmosphere of oxygen. (c) When ferrous sulphide reacts with dilute hydrochloric acid. [3] Study the table given below. Use only the letters given in the table to answer the [3] questions. Do not identify the elements. IA IIA IIIA L M N IVA E VA VIA J VIIA 0 Q G D (a) State the valency of element G . (b) Which element can exhibit catenation? (c) Write the formula of the compound formed between M and P . P Question 5 (i) Given below are two sets of elements from two different periods. [2] Name the element with the highest ionisation potential in each of the following sets. (a) Al, Cl, Mg (b) Ne, O, F T25 522 11 Turn Over (ii) Ammonia gas is passed over heated copper (II) oxide in a combustion tube: (a) [2] Name the gas evolved. (b) What will be the colour of the residue that is left in the combustion tube at the end of the reaction? (iii) (iv) Give balanced equations for the following: [3] (a) Action of dilute hydrochloric acid on ammonium carbonate. (b) Oxidation of sulphur with hot concentrated nitric acid. (c) Reaction of concentrated sulphuric acid with carbon. Rohit took two different salt solutions in test tubes C and D as shown in the figure below. He added dilute HCl to each of the two test tubes. The products formed in the test tubes C and D are silver chloride and lead chloride respectively. dilute HCl dilute HCl S AgNO3 solution Test tube D Test tube C Pb(NO3)2 solution State: (a) one common observation made by Rohit in both the reactions. (b) the observations made by him on addition of excess of ammonium hydroxide to the products formed in: T25 522 1. test tube C 2. test tube D 12 [3] Question 6 (i) Given below is a diagram showing the placement of five different oxides. With [3] respect to the given diagram answer the following questions: (a) Name the type of oxide represented in region X in the diagram. (b) Identify the oxide which has been incorrectly placed in the above diagram. (c) Name the oxide from the above diagram which will form an alkali when dissolved in water. (ii) Given below are organic compounds labelled A to F. [3] Answer the questions that follow: A. B. C. D. E. F. (a) Which compound forms a single product with bromine? (b) Which two compounds have the same molecular formula? (c) Which two compounds will react together in the presence of concentrated H2SO4 to form a product with a fruity smell? T25 522 13 Turn Over (iii) An organic compound X contains carbon, oxygen and hydrogen only. The [4] percentage of carbon and hydrogen are 47.4% and 10.5% respectively. The relative molecular mass of X is 76. Find the empirical formula and the molecular formula of X . [Atomic weight: C = 12, O = 16, H = 1] Question 7 (i) Seema added a few pieces of copper turnings to a test tube containing concentrated [2] acid P and she noticed that a reddish-brown gas evolved. (a) Name the acid P used by Seema. (b) Write a balanced chemical equation for the reaction that took place. (ii) Answer the following questions with reference to the concentration of bauxite ore. (a) Name the process used to concentrate the ore. (b) Give a balanced chemical equation for the conversion of aluminium hydroxide [2] to pure alumina. (iii) Draw the dot and cross structure of the following: (a) An ionic compound formed when Mg reacts with the dilute HCl. (b) A covalent compound formed when H2 reacts with Cl2. (c) The positive ion produced when ammonia gas is dissolved in water. [Atomic number: Mg = 12, Cl = 17, H = 1, N = 7] T25 522 14 [3] (iv) Acidulated water is electrolysed using platinum electrodes. [3] Answer the following questions: (a) Why is dilute sulphuric acid added to water? (b) Write the reaction taking place at the cathode. (c) What is the observation at the anode? Question 8 (i) (ii) (a) State Avogadro s Law. (b) Define Co-ordinate bond. [2] Differentiate between the following pairs of compounds using the reagent given in [2] the bracket: (a) Ammonium chloride and Sodium chloride (using an alkali) (b) Zinc Nitrate solution and Calcium Nitrate solution (using excess sodium hydroxide solution) (iii) You are provided with some compounds in the box. PbO CH4 HCl PbO2 NCl3 [3] CO2 SO2 Choose the most appropriate compound which fits the descriptions (a) to (c) given below: (a) A colourless gas which turns acidified K2Cr2O7 from orange to green. (b) A yellow explosive oily liquid formed when excess chlorine gas reacts with ammonia gas. (c) T25 522 A yellow metallic oxide formed on thermal decomposition of PbCO3. 15 Turn Over (iv) P, Q, R and S are the different methods of preparation of salts. P Simple displacement Q Neutralisation by titration R Precipitation S Direct combination Choose the most appropriate method to prepare the following salts: (a) PbCl2 (b) FeCl3 (c) Na2SO4 ` T25 522 16 [3]

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