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GOLDCREST HIGH, LATUR TRIAL 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 element with the highest ionization potential in the periodic table is: A. He B. Ne C. Ar [5] D. Xe (ii) The ratio between the number of molecules in 2g of hydrogen and 32g of oxygen is (H-1,O-16): A. 1:2 B. 1:0.01 C.1:1 D. 0.01:1 (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) A strong electrolyte from the following is: A. Acetic acid B. Oxalic acid C. Ammonium hydroxide D. Sodium hydroxide (v) Which of the following reactions gives copper as a product: A. Passing dry ammonia over heated copper oxide B. Adding dil, HCl to Copper Oxide C. Heating Copper oxide D. Passing oxygen over heated copper oxide (b) State one relevant observation for each of the following: (i) Dilute Hydrochloric acid is added to Silver Nitrate solution. (ii) Concentrated Nitric acid is added to Copper turnings. (iii) Mixture of Ammonium Chloride and Sodium Hydroxide is heated. (iv) Ammonium hydroxide solution is added in excess to copper sulphate solution. (v) NaOH solution is added to calcium nitrate solution [5] (c) Write balanced chemical equations for each of the following: (i) Catalytic oxidation of ammonia. (ii) Action of concentrated nitric acid on Sulphur. (iii) Action of dilute hydrochloric acid on iron. (iv) Action of concentrated sodium hydroxide on Zinc oxide. (v) Reaction between acetic acid with ethanol in the presence of concentrated sulphuric acid. [5] TRIAL EX -1/CHE/2018-19/KSH This question paper consists of 6 printed pages Page 1
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