Woodlands Prelim P1

6092/01/Prelim/24 EXPRESS EXPRESS EXPRESS Name: ........................................................................ ( ) Class: ................ WOODLANDS SECONDARY SCHOOL PRELIMINARY EXAMINATION 2024 Level: Secondary 4 Express Marks: 40 Subject: Pure Chemistry Day: Tuesday Paper: 6092/01 Date: 20 August 2024 Duration: 1 hour Time: 1030 – 1130 hours READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, index number and class on the Answer Sheet in the spaces 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 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. A copy of the Periodic Table is printed on page 20. The use of an approved scientific calculator is expected, where appropriate. DO NOT TURN THE PAGE UNTIL YOU ARE TOLD TO DO SO. This document consists of 19 printed pages and 1 blank page. FOR EXAMINER’S USE Total /40

2 6092/01/Prelim/24 EXPRESS EXPRESS EXPRESS 1 Which row shows the correct drying agent and the corresponding gas that can be collected by upward delivery into a gas jar as shown in the set-up below? drying agent gas collected A anhydrous calcium oxide carbon dioxide B anhydrous calcium oxide ammonia C concentrated sulfuric acid sulfur dioxide D concentrated sulfuric acid chlorine 2 The diagram below shows the apparatus used to obtain pure water from aqueous iron(II) sulfate. Which statement about the separation process is true? A Liquid Q is pale green in colour. B Liquid P becomes lighter in colour. C The temperature at T steadily rises as liquid Q is being collected. D The concentration of iron(II) sulfate in liquid P increases as liquid Q is being collected. gas drying agent

3 6092/01/Prelim/24 EXPRESS EXPRESS EXPRESS 3 A mixture of propane, butane, hydrogen sulfide and carbon dioxide at –30 °C is allowed to cool down gradually to –200 °C. compound melting point / °C boiling point / °C propane –188 –42 butane –135 –1 hydrogen sulfide –85 –51 carbon dioxide –78 –78 Which compound can be solidified first? A butane B carbon dioxide C hydrogen sulfide D propane 4 The apparatus shown is set up using different gases in the beakers. Which gases, when placed into E and F respectively,