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 relative atomic mass of X element?A31B32C35D387The chemical formula of sodium chlorate is NaClO3 and the chemical formula of thallium sulfate is Tl2(SO4)3. What is the chemical formula of thallium chlorate?ATlClO3BTl(ClO3)2CTl(ClO3)3DTl2(ClO3)38Which solution contains the greatest number of ions?A1 dm3 of 0.1 mol/dm3 Al2(SO4)3B1 dm3 of 0.2 mol/dm3 NH4NO3C2 dm3 of 0.1 mol/dm3 CaCl2D2 dm3 of 0.2 mol/dm3 KI9Excess nitric acid is reacted with 9.00 g of pure calcium oxide to produce 16.20 g of pure anhydrous calcium nitrate crystals.2 HNO3 + CaO  Ca(NO3)2 + H2OWhat is the percentage yield of calcium nitrate? [Ar: H, 1; N, 14; O, 16; Ca, 40]A34.1 %B55.6 %C61.5 %D72.0 %

5 AMKSS 4E Prelim Exam6092/01/2025[Turn Over 10192 g of copper metal is formed when an electric current is passed through a solution of copper(II) nitrate. What is the mass of silver formed if the same electrical current is passed through a solution silver nitrate?A108 gB216 gC324 gD648 g11Which substance will react with dilute nitric acid to give a colourless solution only?Acalcium oxideBiron(II) hydroxideCsodium carbonateDzinc metal12Which salt can be prepared by titration?Aaluminium chlorideBsilver chlorideCsodium nitrateDzinc sulfate13Elements X, Y and Z have consecutive proton numbers. Element Y exists as gaseous atoms.Which statement is correct?AElement X forms an amphoteric oxide when it reacts with oxygen.BElement Y forms a neutral oxide when it reacts with oxygen.CElement Z forms a basic oxide when it reacts with oxygen.DNeither the oxides of X, Y nor Z reacts with an acid to form a salt.14In an experiment, aqueous X is added slowly to aqueous barium hydroxide. The change in

6 AMKSS 4E Prelim Exam6092/01/2025 the electrical conductivity of the reactant mixture is as shown. What could X be?Aaqueous ammoniaBhydrochloric acidCiron(II) sulfateDpotassium chloride15The graph shows the effects of pressure and temperature on the yield of ammonia in the Haber Process to manufacture ammonia. What will be the effect of increasing the temperature but keeping pressure constant on the production of ammonia?AAmmonia is produced at an increased rate and its yield increases.BAmmonia is produced at an increased rate but its yield decreases.CAmmonia is produced at a decreased rate but its yield increases.DAmmonia is produced at a decreased rate and its yield decreases.16Which statement about the manufacturing of ammonia by the Haber Process is not true?

7 AMKSS 4E Prelim Exam6092/01/2025[Turn Over AA high temperature of 450 oC is used.BIt is not possible to obtain 100 % yield of ammonia.CNickel catalyst is used to increase the speed of reaction.DNitrogen is reduced by hydrogen.17Aqueous zinc sulfate is added to excess aqueous barium chloride during an experiment. The precipitate formed is then removed by filtration. What are the ions present in the filtrate?ABa2+ and SO42− BZn2+ and Cl−CZn2+, SO42− and Cl−DZn2+, Ba2+ and Cl−18A series of tests was carried out on an aqueous solution of sodium carbonate and the results were recorded in a table.Which test should be repeated because of an incorrect observation entered in the table? testobservationAadd barium chloride solutionwhite precipitate formedBadd copper(II) chloride solutiongreen precipitate formedCadd potassium hydroxide solutionwhite precipitate formedDadd dilute sulfuric acideffervescence occurred 19A brown precipitate is formed when excess sodium hydroxide is added to solution S. The resulting mixture is heated, and no gas is formed. Aluminium foil is then added to the warmed mixture. A gas that turns damp red litmus paper blue is given off.

8 AMKSS 4E Prelim Exam6092/01/2025 Which ions could be present in solution S?AFe2+ and NO3−BFe3+ and NO3−CFe3+, NH4+ and NO3−DNH4+ and I−20Which method will not slow down the rusting process of an iron nail?AElectroplate the iron nail with silver metal.BCoat the surface of the iron nail with paint.CSubmerge the iron nail in oil.DWeld a piece of copper metal to the iron nail.21The equations shown represent the reactions of a metal M and its oxide.M + 2 HCl  MCl2 + H22 M + O2  2 MO2 MO + C  no reactionWhat could metal M be?AcopperBmagnesiumCsilverDzinc 22Which setup will generate the highest voltage? A

9 AMKSS 4E Prelim Exam6092/01/2025[Turn Over BCD 23Which electrolyte will require two moles of electrons to produce one mole of metal during electrolysis?Aaqueous sodium chlorideBaqueous zinc chloride

10 AMKSS 4E Prelim Exam6092/01/2025 Cmolten magnesium chlorideDmolten aluminium chloride24Why are Group 1 metals generally more reactive than Group 2 metals?AGroup 1 metals have lower melting and boiling points than Group 2 metals.BGroup 1 metals have a greater tendency to form ions than Group 2 metals.CGroup 1 metal ions are less stable than Group 2 metal ions.DThe layer of metal oxide is more soluble on Group 1 metals than Group 2 metals.25The graph shows the information of seven elements in the Periodic Table. Which property should th