2022 CHIJ Chem Prelims P1

CHIJSec/2022/OLevelPrelim/6092/01 [Turn over CONVENT OF THE HOLY INFANT JESUS SECONDARY Preliminary Examination in preparation for the General Certificate of Education Ordinary Level 2022 CANDIDATE NAME CLASS REGISTER NUMBER CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 6092/01 14 September 2022 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and register number on the Multiple Choice Answer Sheet 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 the question paper. A copy of the Periodic Table is printed on page 16. The use of an approved scientific calculator is expected, where appropriate. This document consists of 15 printed pages and 1 blank page. ���

2 CHIJSec/2022/OLevelMY/6092/01 1 One of the instructions for an experiment reads as follows. Quickly add 50 cm3 of acid. What is the best piece of apparatus to use? A a burette B a conical flask C a measuring cylinder D a pipette 2 You have been given a liquid mixture of benzene (C6H6) and a dilute solution of sodium chloride in water. Benzene boils at 80 °C. Which method should be used in the respective sequence to obtain samples of benzene and sodium chloride crystals? first method second method A filtration crystallisation B use a separating funnel evaporation C distillation filtration D evaporation sublimation 3 Oxygen was prepared from hydrogen peroxide and collected as shown in the diagram. 2H2O2 2H2O + O2 The first few tubes of gas were rejected because the gas was contaminated by A water vapour. B hydrogen peroxide. C hydrogen. D nitrogen. aqueous hydrogen peroxide oxygen water manganese(IV) oxide ���

3 [Turn over CHIJSec/2022/OLevelMY/6092/01 4 What is the best method to separate a mixture of sodium chloride crystals and iodine crystals? A sublimation B fractional distillation C filtration D crystallisation 5 An aqueous solution of zinc sulfate is tested by adding reagents. Which observation is correct? reagent added to zinc sulfate observations A acidified aqueous barium nitrate forms a yellow precipitate B aqueous ammonia forms white precipitate, insoluble in excess of the reagent C aqueous sodium hydroxide forms a white precipitate, soluble in excess of the reagent D powdered copper forms a grey precipitate 6 A gas is released at point P in the apparatus shown. Which gas turns the damp universal indicator paper red most quickly? A ammonia B methane C hydrogen chloride D sulfur dioxide ���

4 CHIJSec/2022/OLevelMY/6092/01 7 Which statement about the atoms of all isotopes of chlorine is correct? A They have different number of electrons in the outer shell. B They have the same mass. C They have the same number of neutrons. D They gain one electron to form ions. 8 Two elements, P and Q, are in the same period of the Periodic Table. P and Q react together to form an ionic compound. Part of the lattice of this compound is shown. Which statement is correct? A An ion of P has more electrons than an ion of Q. B An ion of P and ion of Q has different number of electron shells. C An ion of Q has more protons than electrons. D Element P is non-metallic. 9 Students are asked to state • the number of electrons used to form covalent bonds in a molecule of methanoic acid, • the electrical conductivity when the acid is dissolved in water. Which row is correct? number of electrons electrical conductivity in water A 5 poor B 6 good C 8 poor D 10 good ���

5 [Turn over CHIJSec/2022/OLevelMY/6092/01 10 Which pair of statements about diamond and graphite is correct? A They are allotropes of carbon. They are both macromolecules. B They each conduct electricity. They can both be used as electrode. C Diamond has covalent bonds. Graphite has ionic bonds. D Diamond is hard with high melting point. Graphite is soft with low melting point. 11 These two statements are about metals, their properties and bonding. statement 1 Metal conduct electricity when solid. statement 2 In metals, a lattice of positive ions exists in a ‘sea of electrons’ which can move throughout the metal. Which answer is correct? A Both statements are correct and statement 2 explains statement 1. B Both statements are correct but statement 2 does not explain statement 1. C Statement 1 is correct but statement 2 is incorrect. D Statement 2 is correct but statement 1 is incorrect. 12 40 cm3 of the gaseous oxide of element Y requires 60 cm3 of oxygen for complete combustion to produce 80 cm3 of the gaseous oxide YO2. What is the molecular formula of the original oxide given that all gas volumes are measured at room temperature and pressure? A YO B Y2O C Y2O3 D Y2O5 13 N2O4 is a poisonous gas. It can be removed safely by reaction with aqueous sodium hydroxide. N2O4(g) + 2NaOH(aq) → NaNO3(aq) + NaNO2(aq) + H2O(l) What is the minimum volume of 0.8 mol/dm3 aqueous sodium hydroxide needed remove 0.02 mol of N2O4? A 12.5 cm3 B 25.0 cm3 C 50.0 cm3 D 100.0 cm3 ���

6 CHIJSec/2022/OLevelMY/6092/01 14 Iron(II) oxide is produced by heating iron(II) carbonate. FeCO3(s) → FeO(s) + CO2(g) What is the percentage yield of iron(II) oxide if 150 g of iron(II) carbonate produces 50 g of iron(II) oxide? A 50 × 116 × 100 150 × 72 B 50 × 150 × 72 116 C 50 × 150 × 72 × 100 116 D 50 × 116 150 × 72 15 An alternative fuel for cars is hydrogen. Hydrogen can be used in a fuel cell as shown. Which statement about the fuel cell is correct? A Hydrogen gas is oxidised at the negative electrode to form water. B Hydrogen gas is reduced at the positive electrode to form water. C Oxygen gas is oxidised at the positive electrode to form water. D Oxygen gas is reduced at the negative electrode to form water. 16 What is the ionic half-equation for the reaction that occurs at the cathode when molten lead(II) chloride is electrolysed? A Pb2+ + 2e− → Pb B 2Cl− → Cl2 + 2e− C Cl2 + 2e− → 2Cl− D Pb → Pb2+ + 2e− ���

7 [Turn over CHIJSec/2022/OLevelMY/6092/01 17 A few drops of Universal Indicator were added to a beaker of concentrated aqueous sodium chloride and the solution was electrolysed using carbon electrodes. What statement is correct? A A grey solid is deposited at the anode. B A yellowish-green gas is evolved at the cathode. C The colour of Universal Indicator at the anode is colourless. D The colour of Universal Indicator at the cathode is red. 18 A student wishes to use bond energies to calculate the enthalpy change for the reaction shown below. (CH3)3CCl + (CH3)2NH → (CH3)3CN(CH3)2 + HCl Which inventory shows the most efficient means of doing the calculation to compute energies of bonds broken and formed? A bonds broken: 15 C—H, 3 C—C, 2 C—N, 1 C—Cl, 1 N—H; bonds formed: 15 C—H,