Copy of 2024 CCHM Chemistry 6092 P1

[Turn over Name: Class: Class Register Number: PRELIMINARY EXAMINATION 2024 SECONDARY 4 CHEMISTRY 6092/01 Paper 1 Multiple Choice 9 September 2024 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and register number clearly in the spaces provided at the top of this page. 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 16. The use of an approved scientific calculator is expected, where appropriate. This document consists of 16 printed pages.

2 2024 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 1 A student prepares a pure sample of magnesium sulfate from dilute sulfuric acid and magnesium. Which apparatus does the student use? A burette, pipette and an evaporating dish B measuring cylinder and an evaporating dish C beaker, balance, a filter funnel and filter papers D beaker, an evaporating dish, a filter funnel and filter papers 2 A sample of air is passed through the apparatus shown below. What would be the composition of gas A after passing air through aqueous sodium hydroxide and then concentrated sulfuric acid? A carbon dioxide, nitrogen, water vapour B carbon dioxide, nitrogen, oxygen C nitrogen, noble gases, oxygen D noble gases only 3 The chromatogram obtained from a chromatography experiment on substance S is shown. What is the Rf value of S? A 0.35 B 0.48 C 0.56 D 0.62

3 [Turn over 2024 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 4 Three separations are listed. 1. obtaining water from sodium chloride solution 2. obtaining iodine from a mixture of iodine and nickel 3. obtaining solid sodium chloride from aqueous sodium chloride Which techniques would be involved in these separations? 1 2 3 A B C D distillation distillation filtration sublimation sublimation sublimation crystallisation crystallisation evaporation filtration evaporation filtration 5 Some tests are carried out on a sample of water from a factory. The following results were obtained. 1. A white precipitate was formed with barium nitrate and nitric acid. 2. A white precipitate was formed with aqueous ammonia; precipitate was insoluble in excess aqueous ammonia. What compound could be present in the water? A aluminium chloride B aluminium sulfate C zinc chloride D zinc sulfate 6 E