SAJC_H2_CHEM_P1_Qns.pdf - 1 NAME Class ST ANDREWS JUNIOR...

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1 NAME Class ST ANDREW’S JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATIONS Chemistry Higher 2 9729/01 Paper 1 Multiple Choice 18 September 2017 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST: Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name on the Answer Sheet in the spaces provided. There are thirty questions on this paper. Answer all questions. For each question there are four possible answers, A , B , C and D . Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. The use of an approved scientific calculator is expected, where appropriate. This document consists of 19 printed pages and 1 blank page.
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2 1 During a laboratory practical exercise, a student tried to determine the concentration of Fe 2+ (aq) and Fe 3+ (aq) in a given mixture through two different experiments. 1. 25.0 cm 3 aliquot of the Fe 2+ (aq) and Fe 3+ (aq) mixture solution required 15.00 cm 3 of 0.1 mol dm 3 of acidified KMnO 4 solution for complete oxidation. 2. Using another 25.0 cm 3 aliquot, all the Fe 3+ (aq) was first reduced to Fe 2+ (aq) using zinc metal before requiring 34.20 cm 3 of the same KMnO 4 solution for complete oxidation. What is the concentration of Fe 2+ (aq) and Fe 3+ (aq) in the given mixture? A 0.012 mol dm 3 Fe 2+ (aq) and 0.0154 mol dm 3 Fe 3+ (aq) B 0.180 mol dm 3 Fe 2+ (aq) and 0.230 mol dm 3 Fe 3+ (aq) C 0.300 mol dm 3 Fe 2+ (aq) and 0.384 mol dm 3 Fe 3+ (aq) D 0.300 mol dm 3 Fe 2+ (aq) and 0.684 mol dm 3 Fe 3+ (aq) 2 A number of elements in the actinoid series are radioactive and undergo decay to other elements. The following equation is an example of such decay. Pu element A + 9 He 2 4 + 5 e –1 0 94 241 Which of the following gives the identity of element A ? Mass number Atomic number A 205 81 B 205 86 C 223 81 D 237 90
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