2022 BGSS Chem Prelims P1

©BGSS 2015 Name: Register Number: Class: 4E BEDOK GREEN SECONDARY SCHOOL Preliminary Examination 2022 4E Chemistry 6092/1 Paper 1 30 Aug 2022 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write your name, register number and class on the multiple choice answer sheet 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 to be correct and record your choice in soft pencil on the optical mark sheet. Read very carefully the instructions on the Multiple Choice Answer Sheet. INFORMATION FOR CANDIDATES Each correct answer will score one mark. Any rough working should be done in this booklet. A copy of the Periodic Table is on Page 16. This document consists of 16 printed pages including the cover page. © BGSS 2022 No part of this document may be reproduced in any form or transmitted in any form or by any means without the prior permission of Bedok Green Secondary School. [Turn Over ��

©BGSS 2022 2 Section A: Multiple Choice Questions [40 marks] Answer all questions on the Multiple Choice Answer Sheet. 1 The apparatus consists of a porous pot containing a gas X which is surrounded by a gas Y in a gas jar. Which of the following pairs of gases would cause an upward movement of the liquid in the right hand limb of the U-tube? gas X gas Y A H2 NH3 B NH3 CO2 C O2 H2 D O2 CO2 2 Aqueous lead(II) nitrate and aqueous potassium iodide are added to a dish containing water, as shown. A yellow precipitate forms after a few minute. Which process occurs before the precipitate forms? A diffusion B distillation C precipitation D neutralisation Y X gas jar U-tube containing an inert liquid aqueous lead(II) nitrate aqueous potassium iodide yellow precipitate porous pot ��

©BGSS 2022 3 3 Oxygen was prepared from hydrogen peroxide and collected as shown in the diagram. The first few tubes of gas were rejected because the gas was contaminated by A nitrogen. B hydrogen. C water vapour. D hydrogen peroxide. 4 The results of a paper chromatography experiment shown below were obtained. Given that the Rf value of dye P is 0.40, determine the Rf value of dye Q. A 0.50 B 0.60 C 0.70 D 0.80 solvent front dye Q dye P 2.4 cm 3.6 cm start line ink sample aqueous hydrogen peroxide oxygen water manganese(IV) oxide ��

©BGSS 2022 4 5 Which of the following properties cannot be used to test for the purity of a coloured liquid? A filtration B freezing point C fractional distillation D paper chromatography 6 The electronic structure of two atoms P and Q are shown below. When these two elements combine chemically, what will be the type of bonding and mass of one mole of the compound formed? type of bonding mass of one