NYJC_H2_CHEM_P1_QP Prelim

[Turn Over NANYANG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9647/01 Paper 1 Multiple Choice 27 September 2011 1 hour Additional Materials: Mult iple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, CT and NRIC / FIN on the Answer Sheet in the spaces provided. There are forty questions in 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. Read the instructions on the Multiple Choice Answer Sheet carefully. 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. You may use a calculator. This document consists of 14 printed pages.

2 NYJC 2011 H2 Chemistry 9647/01 Prelim Section A For each question in this section, there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1. A sample of 10 dm 3 of polluted air is passed through limewater so that all the carbon dioxide present is precipitated as calciu m carbonate. The mass of calcium carbonate formed is 0.05 g. What is the percentage, by volume, of carbon dioxide in the ai r sample? [A r C, 12.0; O, 16.0; Ca, 40.1] A 0.03 % B 0.05 % C 0.12 % D 0.6% 2. In an experiment, 100 cm 3 of 0.020 mol dm ⎯3 acidified iron (II) sulphate solution is quantitatively oxidized by 50 cm 3 of a solution containing 0.020 mol dm ⎯3 of an oxidizing agent, XO3⎯. What is the final oxidation state of X? A –1 B –2 C +2 D +3 3. A vessel at standard pressure and te mperature contains a mixture of 35Cl2 and 37Cl2. The gaseous mixture occupi es a volume of 5.6 dm 3 and weighs 18 g, calculate the percentage by mass of 35Cl2 in the mixture. A 25 % B 40 % C 50 % D 75 % 4. Equal masses of gaseous N 2, NH3 and N2O are injected into an evacuated vessel to produce a total pressure of 3 atm. How do the partial pressures of N 2, NH3 and N2O compare? A 23 2NN HN OP = P = P B 23 2NN HN OP < P < P C 322NH N N OP < P < P D 223NO N N HP < P < P 5. Which of the following molecules/ ions has the smallest bond angle? A AlH 4⎯ B SO 3 2⎯ C XeF 2 D SF 2

3 NYJC 2011 H2 Chemistry 9647/01 Prelim [Turn Over 6. Cyanamide, NH 2CN, can form a product with boron trifluoride, BF3. Which of the following structures represents the product? A B C D 7. The enthalpy change of solution of magnes ium fluoride is negative (–17.7 kJ mol ⎯ 1) but the enthalpy change of solution of barium fluoride is positive (+3.8 kJ mol⎯1). What conclusion can be drawn from these data? A Magnesium fluoride is soluble in water, but barium fluoride is i