2022 OPSS Chem Prelims P1

ORCHID PARK SECONDARY SCHOOL Preliminary Examination 2022 CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY Paper 1 Multiple Choice Secondary 4 Express Setter: Mr Goh Chye Joo 6092/01 30 August 2022 1 hour 40 Marks Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and register number on the Answer Sheet in the spaces provided. 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 provided on page 17. The use of an approved scientific calculator is expected, where appropriate. This document consists of 17 printed pages. [Turn over

2 1 What is the most suitable method of investigating the different food colourings in some drinks? A crystallisation B filtration C fractional distillation D paper chromatography 2 A mixture contains equal volumes of two liquids. Liquid S has a boiling point of 75 oC. Liquid T has a boiling point of 69 oC. The mixture is heated in the apparatus shown. What is the initial composition of X? A 10 % S and 10 % T B 50 % S and 50 % T C 100 % S D 100 % T

3 [Turn over 3 If, in volumetric analysis between an acid (in the burette) and an alkali, you needed to re-use the same titration flask after the first titration. Which is the best procedure for rinsing the flask? A rinse with a little of the acid B rinse with a little of the alkali C rinse with tap water and then with acid D rinse with tap water and then with distilled water 4 The apparatus shown in the diagram was set up. X How will the water level at X change after a period of time? A It will fall and remain at a lower level. B It will fall, then rise and return to X. C It will rise and remain at a higher level. D It will rise, then fall and return to X.

4 5 A student carried out the following series of tests on an aqueous solution of sodium carbonate and recorded his results as shown in the table. Which test should be repeated because of