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AMITY INTERNATIONAL SCHOOL, NOIDA PREBOARD EXAMINATION CLASS X (2020-21) SCIENCE Time: 3 Hour Maximum Marks: 80 General Instructions: (i) The question paper comprises four sections A, B, C and D. There are 36 questions in the question paper. All questions are compulsory. (ii) Section A - Question no. 1 to 20 - all questions and parts thereof are of one mark each. These questions contain multiple choice questions (MCQs), very short answer questions and assertion - reason type questions. Answers to these should be given in one word or one sentence. (iii) Section B - Question no. 21 to 26 are short answer type questions, carrying 2 marks each. Answers to these questions should in the range of 30 to 50 words. (iv) Section C - Question no. 27 to 33 are short answer type questions, carrying 3 marks each. Answers to these questions should in the range of 50 to 80 words. (v) Section D Question no. - 34 to 36 are long answer type questions carrying 5 marks each. Answer to these questions should be in the range of 80 to 120 words. (vi) There is no overall choice. However, internal choices have been provided in some questions. A student has to attempt only one of the alternatives in such questions. (vii) Wherever necessary, neat and properly labeled diagrams should be drawn. SECTION A Q1. Why do we store silver chloride in dark coloured bottles? OR 3MnO2 + 4Al 1 3Mn + 2Al2O3 On the basis of the above reaction state which is more reactive, Mn or Al and why? Q2. Name the acid and base from which the following salt is obtained: calcium hydrogencarbonate 1 Q3. A molecule of carbon dioxide has: a) Only single bonds. b) Only double bonds. 1
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