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ICSE Class X Prelims 2021 : Physics

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Sriparna Kundu
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ICSE Chemistry: Model Paper 16 Answers to this Paper must be written on the paper provided separately. You will not be allowed to write during the first 15 minutes. This time is to be spent in reading the Question Paper. The time given at the head of this paper is the time allowed for writing the answers. Section I is compulsory. Attempt any four questions from Section II. The intended marks for questions or parts of questions are given in brackets []. SECTION I (40 Marks) Attempt all questions from this Section Question 1: a) a) The following questions are pertaining to the activity series Name a metal: i) Which reacts readily with cold water giving hydrogen ii) Which displays hydrogen from dilute sulphuric acid or hydrochloric acid. iii) Whose hydroxide is a strong base iv) Whose carbonate does not decompose on heating. v) Which displaces iron from iron(III) oxide or ferric oxide. [5] b) Carry out the following conversions. i) Formaldehyde Methane ii) Calcium Carbide Acetylene iii) Acetylene Acetylene tetrabromide iv) Acetylene Benzene Methane v) Methyliodide [5] C) (i). Define a fertilizer. [1] (ii). Name three main classes of fertilizers and give one example of each type. [3] (iii). Give balanced equations to prepare the following. [3] a) Superphosphate of lime b) A fertilizer, using a basic gas and an acidic gas only c) Nitrolim iv. Choose the most appropriate alternative and give reason for your choice. [3] 1. Drying agent for ammonia : Quick lime/ Phosphorus Pentoxide / Conc H2SO4 2. Collection of Nitrogen gas : upward/downward displacement of air/ downward displacement of water. 3. Collection of ammonia gas : upward/downward displacement of air/ downward displacement of water. D) Sulphuric acid may act as each of the following. [5] a) An acid forming sulphate when soluble in water. b) A compound forming sulphate which are insoluble in water. c) A dehydrating agent. d) A drying agent e) An oxidising agent. Which of the above properties (a) to (e) is shown by sulphuric acid when i) Conc H2SO4 acid is added to sugar ? ii) Dil H2SO4 acid reacts with lead nitrate solution ? Jaydip.Chaudhuri 1

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