2023 Sec 4 Pure Chemistry Prelim Catholic High with Answer

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BP- 100 Name: CATHOLIC HIGH SCHOOL Preliminary Examination Secondary 4 (O-Level Programme)wGHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 6092/0r 29 August 2023 'l hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, pencil clips, glue or conection fluid. Write your name, index number and class on the Answer Sheet in the spaces provided 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 one you consider conect and record your choice in soft poncil on the separate Answer Sheet. Each conecl 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 given on page 19. The use of an approved scientific calculator is expected, where appropriate. For examineds use only: Total 140 This document consists of 19 printed pages. PartnerlnLeaming 98 I lndex Number: I I ctass: I I

BP- 1 01 1 The diagrams show four different methods of collecting gases. Which method is suitable for collecting a gas which has the properties described? method for collecting gas properties of gas A B G D 1 2 3 4 less dense than air and soluble in water denser than air and soluble in water less dense than air and soluble in water denser than air and insoluble in water 2 A mixture of three liquids is separated by fractional distillation in the school laboratory. Which two statements are conect? 1 A pure sample of each liquid can be obtained after separation. 2 The mixture boils at constant temperature throughout the separation. 3 The three liquids are miscible with each other. 4 The three liquids are collected at the same time at difierent parts of the fractionating column. A 1and3 B 'l and4 C 2and3 O 2and 4 42 PartnerlnLearning oo 1

BP- 102 3 When heated, magnesium reacts with oxygen in the air to form magnesium oxide, a white powder. A student wants to investigate the percentage purity of a piece of magnesium ribbon. The student is given a balance and three sets of apparatus shown. 1 2 3 magnesium Rmetal tongs burning magnesium heat Which sets of apparatus are suitable for his investigation? A 1,2 and 3 B l and3only C 2 and 3only D 2 only 4 Which substance should be pure for the intended use? A a drug for curing diseases B aluminium for making airplane bodies C petrol for car fuels D tap water for human consumption arr metal tongs crucible tripod ttr I heat PartnerlnLeaming 100 magnesium

BP- r 03 5 P and Q are all samples of colourless alcohols. A paper chromatogram is obtained for samples of P and Q Which row is correct? PartnerlnLeaming 101 PQ statement 1 statement 2 A B c D A locating agent was used A locating agent was used. No locating agent was used. No locating agent was