2026 Chung Cheng Prelim Chemistry 6092 P1 (final) QP

[Turn over Name: Class: Class Register Number: PRELIMINARY EXAMINATION 2026 SECONDARY 4 CHEMISTRY 6092/01 Paper 1 Multiple Choice 28 August 2026 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and class register number clearly in the spaces provided at the top of this page. 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 printed on page 18. The use of an approved scientific calculator is expected, where appropriate. This document consists of 18 printed pages.

2 2026 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 1 A student prepares a pure sample of copper(II) chloride from dilute hydrochloric acid and solid copper(II) oxide. Which apparatus does the student use? A a measuring cylinder, a beaker, a filter funnel, filter papers and an evaporating dish B measuring cylinders, a filter funnel, filter papers and a beaker C a burette, an electronic balance, a beaker and an evaporating dish D a burette, a pipette and an evaporating dish 2 Four separations are listed. 1 obtaining water from potassium chloride solution 2 obtaining iodine from iron 3 obtaining solid potassium chloride from aqueous potassium chloride 4 obtaining ethanol from ethanol and water mixture Which techniques would be involved in these separations? 1 2 3 4 A fractional distillation crystallisation filtration distillation B distillation sublimation filtration fractional distillation C filtration crystallisation evaporation distillation D distillation sublimation evaporation fractional distillation

3 [Turn over 2026 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 3 A paper chromatogram was prepared using a mixture of substances. After drying, the chromatogram is shown in the diagram below. Which statement is correct? A The chromatography paper must have been placed with the solvent above level Z. B When the length of the chromatography paper is doubled, the Rf value of X is doubled. C Substance X is more soluble in the solvent than substance Y. D Locating agents are always needed to interpret a chromatogram. 4 The rate of diffusion of five gases is measured. The gases are CO, N2O, C2H4, C3H8 and N2. The list gives four pairs of gases. 1 N2 and C2H4 2 CO and N2 3 N2O and C3H8 4 C2H4 and C3H8 In which pairs would both gases diffuse at same rates, under the same condition s of temperature and pressure? A 1, 2 and 3 only B 1 and 2 only C 3 and 4 only D 2 and 4 only solvent front start line X Y Z

4 2026 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 5 The symbols of the ions of three elements are Fe56 2+, Co59 3+ and Mn56 2+. Which statement is correct? A Only two ions have the same number of neutrons. B Only two ions have the same number of electrons. C All three ions have the same number of protons. D All three ions have different relative masses. 6 In the molecules CH 3OH, NH 3 and HF, which atoms use all their outer shell electrons in bonding? A C and H B C and F C N and H D H and O 7 Which diagram best represents part of the giant lattice structure of calcium sulfide? A B C D

5 [Turn over 2026 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 8 Sand (silicon dioxide), diamond, poly(ethene) and graphite all contain covalent bonds. Which statement is correct? A Silicon dioxide has each silicon atom covalently bonded to another two oxide ions in a giant structure. B Diamond has each carbon atom covalently bonded to three other carbon atoms in a tetrahedral structure. C Poly(ethene) changes from solid to liquid when heated as its intermolecular forces of attraction are overcome. D Graphite can conduct electricity due to the free ions between the hexagonal layers of carbon atoms. 9 Aqueous copper(II) chloride reacts with aqueous sodium thiocyanate, NaSCN. A precipitate of copper(II) thiocyanate is formed. What is the formula of copper(II) thiocyanate? A CuSCN B Cu2SCN C Cu(SCN)2 D Cu2(SCN)2 10 0.5 mol of propene gas is completely combusted in air. What is the total number of electrons shared by the covalent bonds in the water molecule formed by this reaction? A 3.6 x 1024 B 1.2 x 1024 C 1.8 x 1024 D 6.0 x 1023 11 What is the maximum mass of iron that can be extracted from 116 g of Fe3O4? A 56 g B 84 g C 112 g D 168 g 12 10 cm3 of an aqueous 2.0 mol/dm 3 solution of the hydroxide of metal M exactly neutralises 50 cm3 of 0.20 mol/dm3 aqueous sulfuric acid. What is the formula for the sulfate of M? A MSO4 B M2SO4 C M2(SO4)3 D M(SO4)2

6 2026 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 13 On heating, ammonium nitrate, NH4NO3, decomposes to form dinitrogen oxide and water. NH4NO3 → N2O + 2H2O When 90 g of an impure sample of ammonium nitrate is heated, 28 g of water is formed. What is the percentage purity of ammonium nitrate in the impure sample? A B C D 14 Which of the following statements about an acid is correct? A pH is a measure of acid concentration in a solution. B When an acid reacts with a reactive metal, hydrogen ions lose electrons. C A weak acid can have the same pH as a strong acid. D Universal indicator turns blue when placed in an acid. 15 Two substances, X and Y, are mixed and heated. The damp Universal Indicator paper turns blue during the experiment. What are the possible substances X and Y? A barium hydroxide and ammonium chloride B barium hydroxide and hydrochloric acid C hydrochloric acid and barium nitrate D hydrochloric acid and ammonium carbonate substances X and Y heat damp Universal Indicator paper 28 18 80 90 x x 100 x 28 36 90 80 x x 100 28 18 90 80 x x 100 28 36 80 90 x x 100

7 [Turn over 2026 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 16 Which pair of reagents would be most suitable to safely prepare a pure sample of the salt in the laboratory? reagents salt A potassium and dilute hydrochloric acid potassium chloride B calcium oxide and dilute sulfuric acid calcium sulfate C copper and dilute sulfuric acid copper(II) sulfate D silver nitrate and dilute hydrochloric acid silver chloride 17 Which method of preparation would be suitable for making these salts? metal + acid titration metal carbonate + acid precipitation A lead sulfate ammonium sulfate iron nitrate zinc chloride B iron nitrate zinc chloride sodium sulfate lead sulfate C iron nitrate zinc chloride lead sulfate sodium sulfate D zinc chloride ammonium sulfate iron nitrate lead sulfate 18 Ammonia is produced by the Haber Process. Which statement is not correct? A Three hydrogen molecules react with one nitrogen molecule to form two molecules of ammonia. B A catalyst of iron is used to increase the percentage yield of ammonia. C Hydrogen for the process can be obtained from the cracking of oil. D The percentage yield of ammonia is less than 100% in a closed system.

8 2026 Preliminary Exam/CCHMS/Secondary 4/Chemistry/6092/01 19 What is observed if excess sodium iodide is added to aqueous silver nitrate? A Two c