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ISC Board Exam 2013 Chemistry 1 Paper

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Yu Si
GEMS Modern Academy, Dubai

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B. ANALYSIS OF PERFORMANCE CHEMISTRY PAPER 1 (THEORY) PART I (20 Marks) Answer all questions. Question 1 (a) Fill in the blanks by choosing the appropriate word/words from those given in the brackets: (zero, first, second, increased, decreased, anode, cathode, active, inactive, potassium cyanide, internal, external, dependent, independent, red, benzoic acid, benzoin, common ion effect, salt hydrolysis, alkali, potassium hydroxide.) (i) In a galvanic cell, electrons flow from_________ to _______ through the connecting wires. (ii) [5] Racemic mixtures are optically _________ because of _________ compensation. (iii) Half life period of a _________ order reaction is _________ of the concentration of the reactant. (iv) Benzaldehyde when treated with an alcoholic solution of_______ forms _______. (v) (b) Solubility of calcium oxalate is ________ in the presence of ammonium oxalate because of ___________. Complete the following statements by selecting the correct alternative from the [5] choices given: (i) The compound which is optically active is: (1) 1-butanol (2) 2-butanol (3) 1-propanol (4) 2-methyl-1-propanol (ii) The salt which will not hydrolyse in aqueous solution is: (1) Copper sulphate (2) Sodium sulphate (3) Potassium cyanide (4) Sodium carbonate (iii) Copper has the face centred cubic structure. The coordination number of each ion is: (1) 4 (2) 12 38 [5]

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