2020 SNGS Prelim P1

This document consists of 20 printed pages. [Turn over Name: _______________________________ ( ) Class:___________ PRELIMINARY EXAMINATION GENERAL CERTIFICATION OF EDUCATION ORDINARY LEVEL __________________________________________________________________________ CHEMISTRY 6092/01 Paper 1 Multiple Choice 2 September 2020 1 hour Additional Materials: Multiple Choice Answer Sheet __________________________________________________________________________ READ THESE INSTRUCTIONS FIRST Write your name, register number and class on the Answer Sheet using a soft pencil. There are forty questions in this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the correct answer and record the corresponding letter using a soft pencil on the separate Answer Sheet. Amendments may be done using a soft eraser. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. The use of an approved scientific calculator is expected, where appropriate. A copy of Periodic Table is provided on page 2. The total number of marks for this paper is 40. For Examiner’s Use Total (40)

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3 1 The diagram below shows the fractional distillation of two liquids R and S. R has a boiling point of 80 °C and S has a boiling point of 120 °C. Which statement(s) about the experiment is/are correct? 1. At 70 °C, the vapour at point X contains more R than S. 2. The temperature at point Y is always higher than the temperature at point X. 3. At 90 °C, the liquid remaining in the round bottom flask contains S only. A 1 only B 2 only C 1 and 2 D 1, 2 and 3

4 2 A bottle of copper(II) oxide has been contaminated with some solid potassium chloride. How can the potassium chloride be removed from copper(II) oxide? A Add water to the mixture and filter. B Add dilute acid to the mixture and filter. C Add aqueous silver nitrate to the mixture and filter. D Heat the mixture and allow it to cool. 3 Food dyes 1 and 2 may contain the three harmful substances X, Y and Z. Two chromatograms are developed, one using water as the solvent, and the other using ethanol. The results are shown in the diagram below. Which of the following statement(s) is/are correct? 1. There is a component in food dye 1 that is insoluble in water but soluble in ethanol. 2. The component in Z is more soluble in water than in ethanol. 3. Food dye 2 does not contain any of the three harmful substance. A 1 only B 2 only C 1 and 2 D 1 and 3

5 4 Element X has n protons and forms ions with charge of -2. Element Y has (n+1) protons. What could be formed when element X reacts with element Y? A an ionic compound with formula X2Y B an ionic compound with formula XY2 C a covalent compound with formula X2Y D