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GOLDCREST HIGH, LATUR 1ST TERM END EXAMINATION (2018-19) GRADE: 10 SUBJECT: SCIENCE PAPER-2 (CHEMISTRY) Time: 2 Hours Max. Marks: 80 Answer to this question must be written on the paper provided separately. You will not be allowed to write answers for the first 15 minutes. This time is to be spent on reading the question paper. The time given at the head of this paper is the time allotted for the writing the answer. The paper is divided into two sections. Attempt all questions from Section A and any four questions from Section B. 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) Choose the most appropriate answer. (i) The nature of the oxide of the element in period 3 and Group IIIA A. Basic B. Acidic C. Amphoteric (ii) Which of the following forms an acidic solution in water: A CuSO4 B. Na2SO4 C. Na2CO3 [5] D. Neutral D. NaCl (iii) A salt which in solution gives a bluish white precipitate with NaOH solution and a white precipitate with BaCl2 solution is: A CuSO4 B. FeSO4 C. Fe2 (SO4 )3 D. Cu Cl2 (iv) Among the elements given below, the element with least electronegativity: A Lithium B. Carbon C. Boron (v) Bonding in this molecule can be understood to involve coordinate bonding: A.Carbon tetrachloride B.Hydrogen C.Hydrogen chloride D. Fluorine D.Ammonium Chloride (b) State one relevant observation for each of the following: (i)Lead nitrate solution is treated with sodium hydroxide solution dropwise till it is in excess. (ii)Anhydrous calcium chloride is exposed to air for some time. (iii)Lead nitrate solution is mixed with dilute hydrochloric acid and heated. (iv) Barium chloride solution is slowly added to sodium sulphate solution. (v)Water is added to the product formed when aluminium is burnt in a jar of nitrogen gas [5] (c) Write balanced chemical equations for each of the following: (i) Action of hot and concentrated Nitric acid on copper. (ii)Reaction of sodium hydroxide solution with iron (III) chloride (iii)Reduction of hot Copper(II) oxide to copper using ammonia gas. (iv)Reaction of zinc with potassium hydroxide solution. (v)Action of dilute hydrochloric acid on magnesium sulphite. [5] TEE-1/CHE/2018-19/KSH This question paper consists of 6 printed pages Page 1
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