2022 JVSS Chem Prelims P1

This document consists of 15 printed pages. [Turn over JURONGVILLE SECONDARY SCHOOL PRELIMINARY EXAMINATION 2022 Secondary 4 Express STUDENT NAME CLASS INDEX NUMBER CHEMISTRY 6092/01 Paper 1 Multiple Choice 26 August 2022 1 hour 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 index number in the spaces on all the work you hand in. There are forty questions on this paper. Answe r 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 Multiple Choice 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 printed on page 15. The use of an approved scientific calculator is expected, where appropriate. DO NOT OPEN THE BOOKLET UNTIL YOU ARE TOLD TO DO SO Setter: Mrs Wong Yan Pure ���

2 1 Four identical gas jars are filled with different gases. The lids are taken off the gas jars and they are left open to the air for a few hours. Which gas jar will first contain the most air in it? A B C D 2 A pale green solution X gives a green precipitate with excess aqueous sodium hydroxide. An alkaline gas is only given off when the mixture is warmed with powdered aluminium. Which ions does X contain? A ammonium and copper(II) ions B ammonium and iron(II) ions C copper(II) and nitrate ions D iron(II) and nitrate ions 3 Which app aratus cannot be used to measure the rate of neutralis ation between sol id sodium carbonate and aqueous hydrochloric acid? A electronic balance B gas syringe C stopwatch D thermometer Cl2 CO NH3 SO2 ���

3 4 An analysis is carried out on a plant extract containing some coloured pigments. In Fig. 4.1, a small amount of plant extract is dotted on a chromato graphy paper and separated using solvent A. After drying the chromatography paper, the chromatography paper is subjected to another separation using solvent B, as shown in Fig. 4.2. Fig. 4.1 Fig. 4.2 Which statement is not true? A Pigment 2 is less soluble in solvent A than in solvent B. B Pigment 4 is most likely a pure substance. C Pigments 1 and 3 have a same substance. D The components in pigment 1 have different solubilities in solvent B. 5 An ion X+ contains 23 nucleons and 10 electrons. What does the nucleus of the ion X+ contain? protons neutrons A 9 14 B 10 13 C 11 11 D 11 12 [Turn over rotate 90 o anticlockwise 4 3 2 1 first starting line plant extract first starting lin