2024 Prelims ACJC H2 Chem P1 (QP)

This document consists of 15 printed pages. Anglo-Chinese Junior College JC2 Preliminary Examination Higher 2 CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Data Booklet 9729/01 9 September 2024 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, Centre number and index number on the Answer Sheet in the spaces provided unless this has been done for you. 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. Read the instructions on the 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 booklet. The use of an approved scientific calculator is expected, where appropriate.

2 © ACJC2024 9729/Preliminary Examinations/2024 [Turn over 2 0.01 mol of an unknown ion G2+ required 17.25 cm 3 of 0.23 mol dm −3 acidified KMnO4 to reach the end-point. What is the final oxidation state of element G? A +3 B +4 C +5 D +6 3 Which ion will be deflected the most in an applied electric field? A 79Br+ B 81Br2+ C 81Br+ D 82Br2+ 1 The incomplete combustion of a gaseous hydrocarbon produced 80 cm 3 of carbon dioxide, 40 cm3 of carbon monoxide and 160 cm3 of water vapour. What volume of oxygen was used for combustion of the hydrocarbon? A 40 cm3 B 80 cm3 C 160 cm3 D 180 cm3 4 An unstable ion has • a nucleon number of 219, • 51 more neutrons than electrons, • an atomic number of 84, 85, 86, or 87, What could this ion be? A Po2+ B At3+ C Rn4+ D Fr5+

3 © ACJC2024 9729/Preliminary Examinations/2024 [Turn over pV p N2 B A C D 5 Which species contains two 𝜋 bonds? 1 BF3NH3 2 CH2CHCH2CH3 3 CH2CHCHO 4 HCO2CH2COCH3 A 1 and 4 only B 2 and 3 only C 2 and 4 only D 3 and 4 only 6 What is the strongest intermolecular force in ethanal, ethylamine and decan-1-ol? ethanal ethylamine decan-1-ol A hydrogen bonds hydrogen bonds induced dipoles B permanent dipoles hydrogen bonds induced dipoles C permanent dipoles permanent dipoles hydrogen bonds D hydrogen bonds permanent dipoles hydrogen bonds 7 The volumes and pressures of equal masses of two gases, N 2 and NH3, are separately investigated at constant temperature. The results are plotted on a graph of pV against p. Both gases behave as ideal gases under the conditions chosen. The result for N2 is given. Which plot shows the result for NH3?

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