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ICSE Class X Board Exam 2025 : Chemistry

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HUDDARD HIGH SCHOOL PRELIMINARY EXAMINATION: ICSE-2025 CHEMISTRY (Science Paper -2) Maximum Marks: 80 Time Allowed: Two Hours --------------------------------------------------------------------------------------------------------------------------------------Answers to this paper must be written on the paper provided separately. You will not be allowed to write during first 15 minutes. This time is to be spent I reading the question paper. The time given at the head of this Paper is the time allowed for writing the answers. ----------------------------------------------------------------------------------------------------------------------------------------------Section A is compulsory. Attempt any four questions from Section B. The intended marks for the questions or parts of questions are given in brackets [ ]. Question 1 Section A [40 Marks] (Attempt all questions from this section) Choose the correct answers to the questions from the given options. [15 X 1] (Do not copy the questions; write the correct options along with answers only) i. ii. An oxide which is black in colour is: (a) PbO (b) CuO (c) ZnO 22.4 litres of any gas at S.T.P is equal to the _____ of a gas. (a) 100 GMM (b) 1000 GMM (c) 1 GMM (d) All of these (d) 1 RMM iii. A nitrate which forms a precipitate with ammonium hydroxide and is also soluble in excess of it: (a) Ferrous nitrate. (b) Ferric nitrate (c) Lead nitrate. (d) Copper nitrate iv. Assertion (A): Alkenes and alkynes are unsaturated hydrocarbons. Reason (R): They contain single bond, due to which they are unsaturated and tetravalent in nature. (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true. v. Surgical instruments are mainly made of alloy: (a) Stainless steel (b) Duralumin (c) Brass (d) Type metal Sulphuric acid is also known as: (a) Oil of winter green. (b) Muriatic acid (d) Oil of vitriol vi. (c) Blue vitriol vii. In Homologous series, the successive members differ each other by: (a) CH2 group. (b) CH4 group (c) CH3 group (d) CH group viii. Chloromethane or methyl chloride belongs to the category of: (a) Carboxylic acid (b) Alkyl halides (c) Ketones (d) Alcohols The element having the smallest size in period 2: (a) Lithium (b) Carbon (c) Fluorine (d) Neon ix. x. The process of heating the carbonate ore in limited supply of air or oxygen is called: (a) Roasting (b) Calcination (c) Leaching (d) Pulverisation Page 1 of 6 xi. xii. xiii. Which product is common in both cases? Case 1: Nitre reacts with conc. sulphuric acid. Case2: Chile salt petre reacts with conc. sulphuric acid. (a) KHSO 4 (b) NaHSO4 (c) Both (a) and (b) (d) HNO3 Electrode connected to the positive terminal of battery is: (a) Cathode (b) Anode (c) Electrolyte (d) Inert electrode Which of the following salt is blue in colour? (a) ZnSO4.7H2 O (b)Na2 SO4.10H2 O (c) FeSO4.7H 2O (d) CuSO 4.5H 2 O xiv. Assertion (A) Dry HCl gas is collected by the upward displacement of air. Reason(R): Hydrogen chloride gas is lighter than air (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) A is true but R is false. xv. Decarboxylation is performed using: (a) Quicklime (b) Soda lime (c) Zn/Cu couple (d) Ni/Pt Question 2 i. Answer the following questions based on the diagram given below: [5] The glass retort contains A- Concentrated sulphuric acid and B- Nitre mixed together and heated. (a) What does the given diagram represent? (b) Give balanced chemical reaction for the above preparation. (c) Why the entire set of apparatus is made of glass? (d) What is the colour of C as produced above? What causes that colour to appear? (e) State one specific test for anion present in liquid C. ii. Match the following Column A with Column B. Column A Column B a. Metal sulphide + HCl 1. CO2 b. Metal sulphite + HCl 2. Conc. H2SO4 c. Lime water test only 3. CCl4 d. Covalent compound 4. SO2 e. Drying agent 5. H2S [5] iii. Complete the following by choosing the correct answers from the bracket: (a) Two sets of lone pair of electrons are present in _____ (H2O/ NH 3). (b) Nitrogen trichloride is a _______ (yellow/green) explosive liquid. (c) The oxide ore of zinc is _______ (Calamine/Zincite). (d) Alkynes undergo ______ (addition/substitution) reaction. (e) Sodium chloride conducts electricity in_____ (solid/molten) state. [5] iv. Identify the following: (a) The energy required to remove an electron from a neutral gaseous atom. [5] Page 2 of 6 (b) (c) (d) (e) v. A salt formed by the complete neutralization of an acid with a base. Organic compounds that have same molecular formula but differ in structural formulae. Promoter used in Haber s process. A colourless gas which is basic in nature and gives dense white fumes with HCl. (a) Draw the structures for the following compounds: 1) Pentan-2-ol 2) 2.2- dibromo butane 3) Ethanoic acid [5] (b) Give the IUPAC name of the following organic compounds: 1. 2. SECTION B [40marks] (Attempt any four questions) Question 3 i. Identify the reactant M which is white crystalline solid. It liberates reddish brown gas and the residue is pale yellow when hot but changes white on cooling. Give the balanced chemical equation. [2] ii. What property of sulphuric acid is exhibited in each of the following cases: (a) Conversion of glucose to carbon due to addition of concentrated sulphuric acid. (b) When concentrated sulphuric acid reacts with copper to produce sulphur dioxide. [2] iii. Two elements P and Q have Atomic number 12 and 17. respectively. (a) To which period does P belong. (b) State the valency of element Q. (c) State the type of bonding between P and Q. [3] iv. You are provided with the list of chemicals mentioned below in the box; Lead nitrate, Copper oxide, Zinc, Sulphur, Zinc carbonate, dilute Sulphuric acid, Zincite, Alumina Using suitable chemicals from the list given, write balanced chemical equation for the preparation of the gases mentioned below: [3] (a) Oxygen and nitrogen dioxide as product. (b) Carbon dioxide as product. (c) Hydrogen as product. Question 4 i. Electronic configuration of an atom X is 2,8,7. It combines with another atom Y having electronic configuration 1. (a) What type of bond will be formed between X and Y? (b) Write the formula of the compound formed. [2] ii. Name a nitrogen containing molecule/ ion which: (a) Contains one covalent bond. (b) Contains covalent bonds and a dative bond. [2] iii. Given below in column A is a schematic diagram of electrolysis of fused alumina. Identify the parts labelled A, B and C with correct options from column B . [3] Page 3 of 6 iv. An organic compound contains 12% carbon,1% hydrogen and 86% bromine. If the vapour density of compound is 279, find the empirical and molecular formula. [3] [At wt. C=12, H=1, Br= 80] Question 5 Answer the questions based on diagram given below. [5] i. The above diagram represents electrolysis of molten Lead bromide. (a) Give the reaction of dissociation of molten Lead bromide. (b) What product is obtained at cathode? (c) State the observation at anode. (d) Write the chemical equations which represent the chemical change at cathode and anode. ii. Give balanced chemical equations for each of the following; (a) Laboratory preparation of ethyne from calcium carbide. (b) Zinc is treated with dilute hydrochloric acid. (c) Copper is reacted with cold and dilute nitric acid. [3] iii. Calculate the percentage of nitrogen and calcium in calcium nitride. [ Ca3N2] (Ca= 40, N=14) [2] Question 6 i. State the observation for each of the following: [2] Page 4 of 6 (a) (b) Lead nitrate solution is treated with sodium hydroxide solution drop wise till in excess. Nitric acid is kept in a reagent bottle for a long time. ii. Draw the structural formula of the two isomers of butane. Give the IUPAC name of each isomer. [2] iii. Ethane burns in oxygen to form CO2 and H2O according to the equation: 2 C2H6 + 7 O2 4 CO2 + 6 H2O If 1250 cc of oxygen is burnt with 300 cc of ethane, Calculate: (a) The volume of CO2 formed (b) The volume of unused O2 [3] iv. Elements are arranged in the periods and groups in the periodic table. Their periodic properties vary with the increase in the atomic numbers. Arrange the following elements according to the instructions given in brackets. [3] (a) Li, K, Na, H (decreasing order of their ionization potential) (b) F, B, N, O (increasing order of electron affinity) (c) Mg, Cl, Na, S, Si (increasing order of atomic size) Question 7 i. Name the main component of the following alloys: (a) Brass (b) Duralumin [2] ii. Calculate the number of moles in: (a) 4 grams of sodium hydroxide [Na = 23, O = 16, H = 1] (b) 6.023 10 25 molecules of water [2] iii. Differentiate between the following pairs based on the information given in brackets: (a) Strong electrolyte and weak electrolyte (conductivity) (b) Polar and non-polar covalent compounds (ionisation) (c) Acid and alkali (formation of type of ions) [3] iv. Answer the following questions based on the given diagram. In the given diagram blue colour copper (II) nitrate is heated in a test tube. [3] (a) (b) (c) State your observation when copper nitrate is heated. Name the gas released during this process. Give balanced reaction for above. Question 8 Page 5 of 6 i. The flow chart represents the industrial preparation of Sulphuric acid. Answer the following questions based on the diagram. (a) (b) (c) (d) (e) [5] What is the name of the process shown above? Name the catalyst used for the above process and why is this catalyst preferred? What is the product P obtained in absorption tower? Give balanced equation. Why is concentrated Sulphuric acid kept on air tight bottles? State chemical reaction taking place in presence of catalytic converter. ii. Draw electron dot diagram of Ammonium ion and state the types of bond present. [2] iii. Rachana has solutions X, Y and Z that has pH 2, 7 and 13 respectively. Which solution: (a) Will liberate sulphur dioxide gas when treated with sodium sulphite. (b) Will liberate ammonia gas when treated with ammonium chloride. (c) Will not have any effect on litmus paper? [3] Page 6 of 6

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