2025 AMKSS Prelim P1 QP

[Turn Over Candidate NameForm Class Index Number ANG MO KIO SECONDARY SCHOOLPRELIMINARY EXAMINATION 2025SECONDARY FOUR EXPRESSCHEMISTRY6092/01Paper 1 Multiple Choice2 September 20251 hourSetter: Mr Vincent VooAdditional Materials: Multiple Choice Answer SheetREAD THESE INSTRUCTIONS FIRSTWrite in soft pencil.Do not use staples, paper clips, glue or correction fluid.Write your name, class and index number on the Question Paper and 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 on this question paper.A copy of the Periodic Table is printed on page 17.The use of an approved scientific calculator is expected, where appropriate.This document consists of 17 printed pages and 1 blank page.

2 AMKSS 4E Prelim Exam6092/01/2025 1 A student suspects that substance Z is one of three possible pure substances P, R or S. Two chromatograms of the four substances are obtained using different solvents. The diagrams show the results.What could Z be?ARBSCEither P or SDNeither P, R nor S2The apparatus shown is used to obtain a dry sample of carbon monoxide from a sample of the gas contaminated with sulfur dioxide gas. Which shows the appropriate solutions in bottles 1 and 2 to collect a dry pure sample of carbon monoxide gas?bottle 1bottle 2Aaqueous sodium hydroxideconcentrated sulfuric acidBaqueous sodium hydroxidedilute sulfuric acidCdilute sulfuric acidaqueous sodium hydroxideDdilute sulfuric acidconcentrated sulfuric acid

3 AMKSS 4E Prelim Exam6092/01/2025[Turn Over 3The atmosphere of a newly discovered planet is composed of mainly argon, nitrogen and oxygen gas. The melting and boiling points of these gases are shown in the table.gasmelting point / oCboiling point / oCargon−189−186nitrogen−210−196oxygen−219−183What temperature should a sample of air from the newly discovered planet be cooled to if only liquid oxygen is to be obtained?A−180 oCB−185 oCC−187 oCD−198 oC4Naturally occurring bromine has a relative atomic mass of 80 and consists entirely of two isotopes of relative isotopic masses 79 and 81.What can be deduced about naturally-occurring bromine from this information only?ABromine isotopes have different numbers of protons.BNaturally occurring bromine exist as atoms.CThe two isotopes of bromine exist in equal proportions in nature.DThere is a higher proportion of bromine-81 than bromine-79.5The diagram shows the structural formula of ethane. How many electrons in a molecule of ethane are not involved in bonding?A2B4C7D14

4 AMKSS 4E Prelim Exam6092/01/2025 6The ion X3− has three complete shells of electrons. There are 17 neutrons in its nucleus.What is the