MI_H2_CHEM_P1 Prelims

Class Adm No Candidate Name: This question paper consists of 20 printed pages and 2 blank pages. 2015 Preliminary Examination II Pre-university 3 H2 CHEMISTRY 9647/01 Paper 1 Multiple Choice 23rd Sept 2015 1 hour Additional materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Do not turn over this question paper until you are told to do so Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and admission number in the spaces provided at the top of this page and on the Multiple Choice Answer Sheet provided. There are forty 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 Multiple Choice Answer Sheet provided. Read the instructions on the Multiple Choice Answer Sheet very 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 question paper. The use of an approved scientific calculator is expected, where appropriate. FOR EXAMINER’S USE TOTAL (40 marks)

2 Section A For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 On heating, 0.020 mol of the element M reacts with 0.020 mol of oxygen gas. What is the empirical formula of the oxide of M? A MO B MO2 C M2O D M2O2 2 The electronic configuration of four elements are given below. Which of these elements has the lowest first ionisation energy? A 1s2 2s2 2p3 B 1s2 2s2 2p4 C 1s2 2s2 2p6 3s2 3p3 D 1s2 2s2 2p6 3s2 3p4 3 In which pair of compounds is the permanent dipole moment in Compound I smaller than that in Compound II? Compound I Compound II A CH3CH2Br CH3CHBr2 B CH3CH2F CH3CH2Br C D

3 [Turn over 4 Iodine solid has a density of 4.93 g cm-3. What is the volume of iodine vapour formed w hen 1 cm 3 of solid iodine at room temperature was heated to 300 °C at a pressure of 1 atm? A 0.478 dm3 B 0.912 dm3 C 0.955 dm3 D 1.82 dm3 5 Glucose has the formula C6H12O6. It undergoes combustion in excess oxygen. Some standard enthalpy change of formation values are given below: compound ΔHf o/kJ mol-1 H2O(l) -286 CO2(g) -394 C6H12O6(s) -1273 Which of the following options correctly describes the signs of ΔHo and ΔSo for the combustion reaction of glucose? ΔHo ΔSo A – – B – + C + – D + +

4 6 During electrolysis using inert electrodes , a large current was passed through a dilute copper(II) sulfate solution. What are the products formed at the anode and cathode? anode cathode A copper metal s