2022 MSHS Chem Prelims P1

Class/ Index Number / Centre Number/ ‘O’ Level Index Number / Name MARIS STELLA HIGH SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR CHEMISTRY 6092/01 Paper 1 Multiple Choice 30 August 2022 1 hour Additional Materials: Optical Test Answer Sheet (OTAS) – 1 sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your class, index number, Centre number, O level index number and name in the spaces 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 answer 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 question booklet. A copy of the Periodic Table is printed on page 16. The use of an approved scientific calculator is expected, where appropriate. The total number of marks for this paper is 40. At the end of the examination, hand in the following separately: (1) Optical Test Answer Sheet (OTAS)
 (2) Question Paper This document consists of 16 printed pages. ���

2 1 A gas X is insoluble in water and less dense than air. An impure supply of moist gas X contains a water-soluble impurity. In which order should the pieces of apparatus shown be joined together after Step 1 to collect a pure, dry sample of X? A 2,3,4 B 2,3,5 C 3,2,5 D 3,2,4 2 The diagram shows a chromatogram obtained when a single dye is analysed. Three measurements, x, y and z are shown. How is the Rf value of the dye calculated? A x x + y B y 𝑥 + 𝑦 C x 𝑥 + 𝑦 + 𝑧 D 𝑦 𝑥 + 𝑦 + 𝑧 3 Solid samples of ammonium chloride, lead(II) chloride and sodium chloride were accidentally mixed together. Which of the following sequences outlines the best method to obtain the pure dry sample for each substance? A dissolving, filtration, sublimation, crystallisation B dissolving, fractional distillation, filtration, evaporation C sublimation, dissolving, filtration, evaporation D sublimation, filtration, evaporation, crystallisation ���

3 4 When heated steadily, an impure solid R melted over a range of 121 oC to 126 oC. Which of the following could be the melting point of R? A 120 oC B 121 oC C 125 oC D 128 oC 5 The apparatus below is used to show the diffusion of gases. Which pair of gases X and Y would cause no movement of the water? X Y A CO NO2 B CO2 C2H6 C N2 C2H4 D C2H4 C2H6 6 Benzene, C6H6, melts at 5.5 oC and boils at 80.1 oC