2021 SNGS Prelim P1

This document consists of 18 printed pages. [Turn over Name: _______________________________ ( ) Class:___________ PRELIMINARY EXAMINATION GENERAL CERTIFICATION OF EDUCATION ORDINARY LEVEL __________________________________________________________________________ CHEMISTRY 6092/01 Paper 1 Multiple Choice 31 August 2021 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)

2

3 1 The chromatogram of the dyes used for a coloured crayon is shown in the diagram below. Which of the following statements can be deduced from the chromatogram? A The colour of the crayon is red. B The Rf value of the yellow dye is lower than that of the blue dye. C The yellow dye is more soluble than the blue dye in the solvent used. D The molecules of the yellow dye are smaller than those of the blue dye. 2 The diagram below shows three reactions of solution X. What are the ions present in solution X? A aluminium ions and nitrate ions B ammonium ions and chloride ions C lead(II) ions and ammonium ions D lead(II) ions and nitrate ions starting line yellow blue solvent front Solution X gas turns moist red litmus paper blue white precipitate white precipitate insoluble in excess aqueous ammonia NaCl (aq) excess NaOH(aq), Al foil, warm NH3(aq)

4 3 Which one of the following could be used to distinguish aqueous solutions of sodium chloride and sodium iodide? A aqueous barium chloride B aqueous silver nitrate C aqueous sodium hydroxide D aqueous sulfuric acid 4 Four gases namely, ammonia, chlorine, hydrogen chloride and hydrogen are placed in separate gas jars containing a strip of moist blue litmus paper and moist red litmus paper each. The gases in w hich gas jar will cause both the moist blue litmus paper and the moist red litmus paper to change colour? A red litmus ammonia blue litmus B blue litmus red litmus chlorine red litmus blue litmus hydrogen