Prelim Paper 1 QP_ACJC H2 Chem

1 © ACJC 2025 9729/01/Prelim/2025 [Turn over Anglo-Chinese Junior College JC2 Preliminary Examination Higher 2 CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Data Booklet 9729/01 17 September 2025 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name and index number on the Answer Sheet in the spaces provided unless this has been done for you. There are thirty questions in this section. 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. This document consists of 15 printed pages.

2 © ACJC 2025 9729/01/Prelim/2025 [Turn over 1 The most common oxidation state of americium, Am, in aqueous solution is +3. Recently, Cu3+ has been shown to quantitatively oxidise Am3+(aq) in dilute HNO3, while itself is reduced to Cu2+. In an experiment, 20.0 cm 3 of 0.0120 mol dm –3 Am3+(aq) was found to require 24.00 cm3 of 0.0300 mol dm–3 Cu3+ for complete oxidation. What is the formula of the americium-containing species formed? A Am2O22+ B AmO22+ C AmO2+ D AmO+ 2 Use of the Data Booklet is relevant to this question. The table shows the fifth, sixth, seventh, eighth, ninth and tenth ionisation energies of an element (Z ≤ 20) in the Periodic Table. 5th 6th 7th 8th 9th 10th ionisation energy / kJ mol–1 7975 9590 11343 14944 16964 48610 What can be inferred about the element from the above data? A It is in the third period of the Periodic Table. B It is in Group 2 of the Periodic Table. C It is likely to form an ionic compound when reacted with oxygen. D Its 6th and 7th electrons are removed from different subshells. 3 Particle R has a proton number n and forms a stable monoatomic ion of charge ‒1. Particle S has a proton number of ( n+2) and it forms a stable monoatomic ion which is isoelectronic with the ion of R. Which statement is correct? A Ion of S has a smaller ionic radius than ion of R. B R has a larger atomic radius than S. C Ion of S requires less energy than ion of R when an electron is removed from each particle. D Ion of R releases more energy than ion of S when an electron is added to each particle.

3 © ACJC 2025 9729/01/Prelim/2025 [Turn over 4 Which statement about the trend in the property of the halogens down the group is correct? A The electronegativity increases. B The volatility increases. C The enthalpy change of reaction with hydrogen becomes less exothermic. D The react