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Chemistry Mock Paper

5 pages, 92 questions, 95 questions with responses, 154 total responses,    0    0
faiz Khan (funky faiz)
R. B. K. School (RBK), Mira Road
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__________________________________________________________________________________ CHEMISTRY SCIENCE PAPER 2 (Two hours) 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. _________________________________________________________________________________ Attempt all the questions from Section 1 and any four 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 I] Name the following: [5] (i) The acid present in three parts by volume in aqua regia. (ii) An explosive compound formed when ammonia reacts with excess of chlorine. (iii) A black oxidising agent that oxidises hydrochloric acid to chlorine. (iv) The dehydrated product obtained when sulphuric acid is added to cellulose. (v) An unsaturated hydrocarbon formed by dehydration of ethyl alcohol with (vi) (vii) (viii) (ix) (x) concentrated sulphuric acid. The acid prepared by catalytic oxidation of ammonia. The chemical formula of gypsum. A hydrated salt that is blue in colour. A nitrate which on thermal decomposition forms a yellow amphoteric oxide as a residue. The nitrate which gives a black residue on heating. II] A solution P has a pH of 13, a solution Q has pH= 6 and a solution R has a pH= 2 (i) (ii) (iii) (iv) (v) Answer the following questions: [5] Which solution is a strong acid? If an alkali is added to solution R, will the pH increase or decrease? Which solution is a weak acid? Which solution will liberate ammonia gas from ammonia sulphate on heating? An ion is formed when an acid and a base dissolves in water. Draw the structure of the two ions. III] Write the balanced equation for the following: [5] (i) A mixture of soda lime and soda acetate is heated. (ii) Ethanol reacts with sodium at room temperature. (iii) Monochloro ethane is hydrolysed with aqueous KOH. (iv) Zinc is reacted with sodium hydroxide solution. (v) Dilute sulphuric acid is poured over sodium sulphite. IV] Give the structural formula for the following: [5] (i) Acetone. (ii) Ethanal. (iii) Dichloromethane. __________________________________________________________________________________1 T152 567 Turn Over

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