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ICSE Class X Prelims 2026 : Chemistry (Wisdom High International School (WHIS), Nashik)

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Avaneesh Nambiar
Children's Academy, Thakur Complex, Kandivali East, Mumbai

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WISDOM WORLD SCHOOL Kumar Picasso, Hadapsar Preliminary Assessment I 2025-26 Date: 15-12-2025 Max. Marks: 80 Reading Time: 10 min Writing Time: 2 hours Std: X SUBJECT: CHEMISTRY (Science Paper II) General Instructions: Answers to this Paper must be written on the answer sheet provided by the school. You will not be allowed to write in the first 10 minutes. This time is to be spent in reading the Question Paper. SECTION A (40 marks) (Attempt all questions from this Section) Question 1 (a) Choose the most appropriate answer from the given options: (i) (ii) (iii) The metals lead and tin are present in the alloy _______. (a) Brass (b) Solder (c) Duralumin (d) Bronze Identify the statement that is incorrect about alkanes. (a) They are hydrocarbons. (b) They can undergo both substitution and addition reactions. (c) There is a single covalent bond between carbon carbon atoms. (d) On complete combustion they produce carbon dioxide and water. Table below represents three elements P, Q and R along with their atomic numbers. Which elements belong to the same group? Elements Atomic number (iv) [15] P Q R 2 11 18 (a) P and Q (b) P and R (c) Q and R (d) P,Q and R The drying agent used to dry hydrogen chloride gas is ___________. (a) P2O5 (b) CaO (c) conc. H2SO4 (d) CaCl2 Page 1 of 8 (v) (vi) (vii) (viii) The reaction conditions required to produce the highest yield of sulphur trioxide during contact process are : 1. 450 500oC 2. 200 900 atm 3. Vanadium pentoxide (a) 1, 2, 3 (b) 1, 4, 5 (c) (d) 1, 3, 5 (x) (xi) (xii) 1, 4 The organic compound mixed with ethanol to make it spurious is: (a) Methanol (b) Methanoic acid (c) Methanol (d) Ethanoic acid Which of the following compounds in solution form will be the best electrolyte for electroplating an iron spoon with silver? (a) Silver nitrate (b) Silver chloride (c) (d) Silver sulphate Sodium argentocyanide An electrolyte which completely dissociates into ions is: (a) (ix) 4. Platinum 5. 1 2 atm Alcohol (b) Carbonic acid (c) Sucrose (d) Sodium hydroxide The law that equates the number of molecules of a gas with its volume is _____ . (a) Charles law (b) Avogadro s law (c) Boyles law (d) Gay Lussac s law The molecular formula of a gas with vapour density 15 and empirical formula CH3 is (a) C2H6 (b) C4H12 (c) C5H15 (d) CH3 Among the following pairs of ions, identify the pair of ions whose hydroxides dissolves in excess NaOH solution. (a) Zn +2 , Fe+2 (b) Pb +2 , Zn+2 (c) Fe +3 , Zn +2 (d) Fe +2, Pb+2 When sulphur is added to hot and conc. nitric acid, the oxidised product is A . When sulphur is added to hot and conc. sulphuric acid, the oxidised product is B . Identify A and B . (a) Both A and B are SO2 (b) Both A and B are H2SO4 (c) A is SO2 , B is H2SO4 (d) A is H2SO4 , B is SO2 Page 2 of 8 (xiii) (xiv) (xv) Element X occurs in nature in solid state. X burns in oxygen and the resultant product is soluble in water. The solution when tested with red litmus paper, causes the paper to turn blue. Element X is likely to be : (a) Sulphur (b) Carbon (c) Sodium (d) Copper Solution A reacts with an acid B to give white precipitate C which is soluble in ammonium hydroxide. Identify the compounds A, B, and C. (a) Magnesium nitrate, Sulphuric acid, Magnesium Sulphate (b) Lead nitrate, Hydrochloric acid, Lead Chloride (c) Copper (II) nitrate, Sulphuric acid, Copper (II) Sulphate (d) Silver nitrate, Hydrochloric acid, Silver Chloride An example of a cyclic organic compound is : (a) Propene (b) Pentene (c) Benzene (d) Butene Question 2 (i) Flowchart below shows the process of dressing/concentration of the aluminium ore. Bauxite A Caustic alkali Sodium aluminate B Filtration [5] Hydrolysis and precipitation to give Al(OH)3 C Ignition Pure alumina (a) Name the process depicted above. (b) Give the balanced chemical equations for the conversions A and B. (c) Why is caustic alkali used in the conversion A? (d) State the impurities filtered out before the conversion to B. (ii) Complete the following by choosing the correct answers from the brackets: (a) An organic compound having carbon-carbon single covalent bond is (C4H8/ C4H10 / C4H6) and is commonly known as a/an _______ (olefin / paraffin) (b) As we descend the electrochemical series containing cations, the tendency of cations to get _____ (oxidized /reduced) at the cathode increases. (c) The third member of the homologous series having general formula CnH2n is _________( butyne / butene / propene) Page 3 of 8 [5] (iii) State suitable terms for the following: [5] (a) Process by which ethane is obtained from ethene. (b) A pair of unshared electrons present in a covalent molecule. (c) An oxide which forms salts when it reacts with both acids and alkalis. (d) A homogenous mixture of two or more metals fused together in the molten state. (e) The process of heating the concentrated ore in a limited supply of air or in absence of air. (iv) State one relevant observation for each of the following: [4] (a) A few drops of sodium hydroxide solution are added to a test tube containing Zinc chloride solution. (b) At the anode when fused lead bromide undergoes electrolysis using graphite electrodes. (c) Ammonia gas burns in an atmosphere of excess oxygen. (d) Bromine vapours are passed into a solution of ethyne in carbon tetrachloride. (v) (a) 1. Give the IUPAC name of the following organic compounds: H OH H | | | H C C C H | | | H H H 2. [3] Cl Cl | | H C C H | | Cl Cl 3. CH3 CH CH2 C = CH2 | | CH3 Cl (b) Draw the structural diagram for the following compounds: [3] 1. Formaldehyde 2. pent-2-yne 3. iso-butane SECTION B (40 Marks) (Attempt any four questions from this Section) Question 3 (i) Draw the electron dot structure showing the formation of hydronium ion. Page 4 of 8 [2] (ii) Arrange the following as per the instructions given in brackets: (a) Propene, Propane, Ethyne, Ethane [in decreasing order of molecular weight] [2] (b) N, Be, O, C [in increasing order of non-metallic character] (iii) Find the ratio between the volumes occupied by 23 grams of nitrogen dioxide gas and 20 grams of hydrogen gas. [N=14, O=16, H=1] [2] (iv) Identify the cations and anions present in the following salts on the basis of the observations given. Tabulate the answers in the format given below : [4] Salt A B Cation present --------------- Anion present ------------------ (a) Salt A gives a lilac flame when the paste of this salt is subjected to flame test. Addition of dil. HCl to this salt produces a gas which turns moist lead acetate paper silvery black. When sodium hydroxide is added to a salt solution B, dirty green precipitate is (b) formed which is insoluble in excess of sodium hydroxide. On addition of barium chloride solution, this salt gives a white precipitate which is insoluble in dilute mineral acids. Question 4 (i) Observe the reactions given below and answer the following questions : X + H 2O H2SO4 + Compound P + Zn [3] Y + H2 (a) Identify compound P. (b) Write the reaction taking place between the identified compound P and sulphuric acid. (c) Name compound Y. (ii) Define the following: [2] (a) Catenation (b) Homologous series (iii) An organic compound has vapour density 94. It contains C=12.67%, H=2.13% and Br=85.11%. [C=12, H=1, Br=80] (a) Find the molecular formula of the organic compound. (b) Draw the structural formula of the compound and state its IUPAC name. (c) State the type of reaction when the above organic compound is boiled with hot conc. alcoholic potassium hydroxide. Page 5 of 8 [5] Question 5 (i) Match the following: [3] Column A Column B (a) Ferrous chloride 1. Titration (b) Ferric chloride 2. Direct combination (c) Lead sulphate 3. Precipitation 4. Simple displacement 5. Neutralization (ii) Write balanced chemical equation for the preparation of salts (a) to (c) listed in (i) based on the method selected above. (iii) The diagram below shows heating of ethanol and ethanoic acid alongwith conc.sulphuric acid. Answer the following questions: [3] [4] (a) Name the type of reaction occurring in the above set up. (b) Write the balanced equation for the above reaction. (c) What is the role of conc. sulphuric acid in this reaction ? (d) State one observation that takes place in the reaction. Question 6 (i) Write the balanced chemical equations for the following: [3] (a) Lab. preparation of ethene from ethyl alcohol. (b) Complete combustion of methane. (c) Reaction between acetic acid and sodium hydroxide. (ii) Write the formula of the chloride that can be described as: (a) A sublimable solid. (b) Insoluble in cold water but soluble in hot water. (c) Salt used in the preparation of muriatic acid. Page 6 of 8 [3] (iii) (a) Define: 1. Alkene 2. Isomerism. [4] (b) Draw the isomers of butene showing position isomerism. Question 7 (i) Certain blank spaces are left in the following table as P, Q, R and S. Identify each one of them. Lab. preparation of Reactants used Products formed Method of collection Ammonia gas Mg3N2 + H2O P Q Methane gas R CH4 + Na2CO3 S (ii) Copper reacts with dil. nitric acid to give copper nitrate, water and nitric oxide. 3Cu + 8HNO3 3Cu(NO3)2 + 4H2O + 2NO [Cu=64, H=1, O=16, N=14] Calculate: [4] [2] (a) The mass of copper needed to react with 126g of HNO3. (b) Volume of nitric oxide obtained at the same time. (iii) Give reason: [2] (a) Pure acetic acid is called glacial acetic acid. (b) A freshly prepared iron (II) sulphate solution is used in the brown ring test. (iv) Name the following: [2] (a) The formula showing the simplest whole number ratio between the atoms of the elements in a compound. (b) The salt formed by the partial replacement of the replaceable hydrogen ion of an acid molecule by a basic radical. Question 8 (i) A compound having empirical formula X2Y is made of two elements X and Y. Find the molecular formula of the compound if the atomic weight of X is 10 and that of Y is 5. The compound has a vapour density of 25. [2] (ii) Identify the reactants L, M and N in the following reactions: [3] (a) Copper (II) oxide + L Copper + water + nitrogen (b) M Lead (II) oxide + nitrogen dioxide + oxygen (c) Sodium nitrate + N <200 Sodium bisulphate + nitric acid (vap.) Page 7 of 8 (iii) State the condition/s required for the following reactions to take place: [3] (a) Conversion of ethane to hexachloroethane. (b) Conversion of ethanol to ethylene. (c) Preparation of ammonia by Haber s process. (iv) Name the main metal present in the following alloys: (a) Bronze (b) Duralumin ************************************************************************ Page 8 of 8 [2]

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