2024 NYJC H1 Chem 8873 P1

[Turn over NANYANG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 1 CHEMISTRY 8873/01 Paper 1 Multiple Choice 16 September 2024 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and tutor’s name 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. This document consists of 16 printed pages.

2 H1 Chemistry 8873/01 NYJC J2/24 PX 1 Use of the Data Booklet is relevant to this question. 20 g of ethanol and 30 g of propanoic acid are heated under reflux, 22 g of ethyl propanoate is obtained. What is the yield of the ester? A 50% B 53% C 56% D 60% 2 Use of the Data Booklet is relevant to this question. 0.144 g of an aluminium compound A react with excess water to produce a gas. This gas burns completely in oxygen to form water and 72 cm3 of CO2 only. What is the molecular formula of compound A? [All volumes were measured at room temperature and pressure.] A Al2C3 B Al3C4 C Al4C3 D Al5C3 3 In this question, assume only V and Zn change oxidation numbers. Two moles of VO 2+ ions react with one mole of zinc atoms in the presence of dilute acid. The products include Zn 2+ ions and an ion, Y. Ion Y contains vanadium. What is ion Y? A VO3− B VO+ C VO2+ D VO22+

3 H1 Chemistry 8873/01 NYJC J2/24 PX [Turn over 4 A single 32P nucleus can be produced when a single 32S nucleus reacts with particle X. In the process a proton is emitted. What is particle X? A a deuteron, B an electron C a neutron D a proton 5 Which statement about the electrons in a n aluminium atom at ground state is correct? A Electrons are present in three different energy levels. B There are more electrons in s orbitals than there are in p orbitals in total. C The occupied orbital of lowest energy is circular. D The e lectron from the occupied orbital with the highest energy is removed first during ionisation. 6 In which process does bond angle decrease at the relevant central atom? 1 when ice melts 2 oxidation of SO2 to SO3 3 oxidation of a secondary alcohol by acidified KMnO4 4 dimerisation of aluminium chloride A 4 only B 1 and 3 only C 1 and 4 only D 2 and 3 only 7 When two liquids are mixed, heat may be evolved if intermolecular bonds formed are