2022 ZSS Chem Prelims P1

Paper 1 Multiple Choice 13 September 2021 1 hour Additional Materials: Multiple Choice Answer Sheet Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zheng hua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School Zhenghua Secondary School 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. There are forty questions on this paper. Answer all questions. For each question, there are four possible answers, A, B, C or 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 18. The use of an approved scientific calculator is expected, where appropriate. Name of Setter: Ms Nur Elfianie Abdul Samad This document consists of 19 printed pages including this cover page. [Turn over ZHENGHUA SECONDARY SCHOOL PRELIMINARY EXAMINATION 2022 SECONDARY FOUR EXPRESS CHEMISTRY 6092/01 Candidate Name: _____________________________ Index No: _____ Class: _________

2 1 Th rate of diffusion of five gases is measured. The gases are CO, CO 2, NH3, C3H8 and N2., The list gives five pairs of gases. 1 CO and CO2 2 CO and N2 3 CO2 and C3H8 4 NH3 and N2 5 NH3 and CO In which pairs would one gas diffuse faster than the other under the same conditions of temperature and pressure? A 1 and 4 B 2 and 3 C 2, 3 and 5 D 1, 4 and 5 2 The boiling points of some substances found in air are given in the table. When the temperature is raised from -350○C to -190○C, which substance(s) will be liquid? substance boiling point / ○C argon -186 neon -246 oxygen -196 nitrogen -183 A argon only B argon and oxygen C neon and nitrogen D neon and oxygen

3 3 A gas has no effect on both red and blue litmus papers but is soluble in water and less dense than air. Which diagram shows the best way of drying and collecting the gas? A B C D 4 An aqueous solution of a salt is tested and the following results are obtained. test result addition of a few drops of aqueous sodium hydroxide followed by addition of excess aqueous sodium hydroxid