23MIPrelimQP (H2 Chem Paper 1)

Class Adm No Candidate Name: This question paper consists of 14 printed pages and 2 blank pages. 2023 Preliminary Examination Pre-University 3 H2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 20 September 2023 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 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 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 (30 marks)

2 For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 Which of the following contain the same number of hydrogen atoms? 1 0.10 mol of pentane 2 0.15 mol of but-2-ene 3 0.60 mol of hydrogen gas 4 0.50 mol of steam A 1, 2 and 3 only B 1 and 4 only C 2 and 4 only D 1 and 2 only 2 Ascorbic acid found in fruits and vegetables is believed to help prevent colds. Analysis of ascorbic acid shows that it contains only carbon, hydrogen and oxygen with 40.91% carbon and 4.55% hydrogen by mass. Ascorbic acid has a molar mass of 176 g mol–1. What is the molecular formula of ascorbic acid? A C2H3O2 B C3H4O3 C C6H8O6 D C6H9O6 3 Which of the following species is unable to act as a Lewis acid? A AlCl3 B FeCl3 C BeCl2 D CCl4

3 [Turn over 4 In 2020, a massive explosion took place in Beirut at a warehouse which stocked ammonium nitrate. Ammonium nitrate, NH4NO3 decomposes explosively when heated to form nitrous oxide, N2O and water, H2O. What is the change in the oxidation number of the nitrogen atom that is underlined when this reaction happens? A –2 B +1 C +3 D +4 5 Use of the Data Booklet is relevant to this question. What do the ions 31P3– and 32S2– have in common? A Both ions have more neutrons than protons. B Both ions have more electrons than neutrons. C Both ions have more protons than electrons. D Both ions have an outer electronic configuration of 2s2 2p6. 6 The table below shows the ionisation energy (in kJ mol–1) of four elem