2025 CHIJ SEC (TP) Chemistry Prelim Paper 1 QP

CHIJSec/2025/OLevelPrelim/6092/01 [Turn over O CONVENT OF THE HOLY INFANT JESUS SECONDARY Preliminary Examination in preparation for the General Certificate of Education Ordinary Level 2025 CANDIDATE NAME CLASS REGISTER NUMBER CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 6092/01 29 August 2025 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 16 printed pages.

2 CHIJSec/2025/OLevelPrelim/6092/01 1 An experiment is done to determine the rate of decomposition of hydrogen peroxide. 2H2O2(aq) → 2H2O(l) + O2(g) Which pieces of apparatus are needed for this experiment? A conical flask, gas syringe, stopwatch B conical flask, gas syringe, thermometer C conical flask, stopwatch, thermometer D gas syringe, stopwatch, thermometer 2 The diagram shows a set-up used to separate two substances in a mixture. Which mixtures can be separated using this set-up? A ammonium chloride and iodine B ammonium chloride and sodium chloride C copper(II) sulfate and sodium carbonate D lead(II) chloride and potassium chloride filter funnel evaporating dish mixture heat

3 [Turn over CHIJSec/2025/OLevelPrelim/6092/01 3 The apparatus shown in the diagram was set up. Which row correctly shows the pair of gases that will cause the water level at U to rise? gas 1 gas 2 A carbon dioxide nitrogen B methane sulfur dioxide C nitrogen carbon monoxide D sulfur dioxide methane 4 An atom of one isotope of chlorine is represented by the symbol Cl37 . Particle R has one more neutron, two more protons and one more electron than this isotope of chlorine. Which symbol represents R? A Cl38 + B Cl38 − C K39 D K40 + 5 Which diagram best represents a mixture of neon and hydrogen bromide? air air gas 2 gas 1 porous pot porous pot beaker water A B C D

4 CHIJSec/2025/OLevelPrelim/6092/01 6 Elements X and Y react to form an ionic compound of formula XY2. Which row correctly shows the electronic configurations of atoms X and Y? atom X atom Y A 2, 1 2, 5 B 2, 4 2, 6 C 2, 8, 1 2, 8, 6 D 2, 8, 8, 2 2, 8, 7 7 Which compound contains an element that does not achieve the electronic configuration 2,8? A Al2O3 B CF4 C CO2 D H2O 8 Which particles are responsible for the conduction of electricity through metals? A electrons only B electrons and positive ions C negative and positive ions D positive ions only 9 When heated, 4 moles of compound Z produced 2 moles of oxygen gas and 4 moles of chlorine gas as the only products. What is likely to be the molecular formula of compound Z? A ClO2 B Cl2O4 C Cl2O D Cl4O2 10 Hydrated sodium carbonate crystals have the formula Na 2CO3•10H2O in which one mole of sodium carbonate is combined with 10 moles of water. What is the percentage by mass of oxygen in hydrated sodium carbonate crystals? [Ar: Na, 23: C, 12; O, 16; H, 1] A 10  16 124  100 B 10  16 286  100 C 13  16 124  100 D 13  16 286  100

5 [Turn over CHIJSec/2025/OLevelPrelim/6092/01 11 Carbon monoxide and oxygen gas react to form carbon dioxide according to the equation shown. 2CO(g) + O2(g) → 2CO2(g) 20 cm3 of carbon monoxide is reacted with 20 cm 3 of oxygen gas to form carbon dioxide, at room temperature and pressure. What are the volumes of gases remaining, at room temperature and pressure, at the end of the reaction? carbon monoxide oxygen gas carbon dioxide A 0 cm3 0 cm3 20 cm3 B 0 cm3 10 cm3 40 cm3 C 0 cm3 10 cm3 20 cm3 D 10 cm3 0 cm3 30 cm3 12 The empirical formula of an oxide of element X is X2O5. 106.5 g of X2O5 contains 60 g of oxygen. What is the identity of X? A P15 31 B Ca20 40 C Ga31 70 D Lu71 175 13 What volume of water must be added to dilute 100 cm 3 of 8.0 mol/dm3 hydrochloric acid to a concentration of 2.0 mol/dm3? A 200 cm3 B 300 cm3 C 400 cm3 D 500 cm3

6 CHIJSec/2025/OLevelPrelim/6092/01 14 Aqueous sodium chloride and aqueous lead(II) nitrate react according to the equation shown. 2NaCl(aq) + Pb(NO3)2(aq) → PbCl2(s) + 2NaNO3(aq) 20 cm3 of 2 mol/dm3 aqueous sodium chloride is reacted with excess aqueous lead(II) nitrate. 3.34 g of lead(II) chloride precipitate is formed. What is the percentage yield for the reaction? A 6 % B 12 % C 30 % D 60 % 15 Dilute methanoic acid reacts with aqueous potassium hydroxide as shown. HCOOH(aq) + KOH(aq) → HCOOK(aq) + H2O(l) What is the ionic equation for this reaction? A COOH− (aq) + K+ (aq) → HCOOK (aq) B H+ (aq) + OH− (aq) → H2O (l) C HCOO− (aq) + K+ (aq) → HCOOK (aq) D HCOOH (aq) + K+ (aq) → HCOOK (aq) 16 Zinc oxide was added separately to dilute solutions of an acid and an alkali. What row gives the correct observations? acid alkali A no reaction no reaction B no reaction salt formed C salt formed no reaction D salt formed salt formed 17 Different solids were added to separate portions of warm dilute sulfuric acid. Which row shows the solid with the correct result? solid result A ammonium chloride gas evolved that turns damp red litmus paper blue B copper gas evolved that ‘pops’ with a lighted splint C magnesium oxide solid dissolves to form a colourless solution D zinc carbonate gas evolved that relights a glowing splint

7 [Turn over CHIJSec/2025/OLevelPrelim/6092/01 18 Some statements about two strong acids, HX and H2Y, of the same concentration are given. 1 H2Y has a lower pH than HX. 2 The rate of production of carbon dioxide is faster for H 2Y than HX when equal volumes of both acids are reacted with sodium carbonate. 3 More hydrogen gas is produced for HX than H2Y when equal volumes of both acids are reacted with excess magnesium. Which statements are correct? A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3 19 Different salts can be made by adding different reagents together. Which row shows the correct reagents used to safely make the salt? salt reagents A calcium nitrate calcium chloride and nitric acid B copper(II) sulfate copper(II) nitrate and sodium sulfate C magnesium carbonate magnesium nitrate and potassium carbonate D sodium chloride sodium and hydrochloric acid 20 Ammonia is manufactured by the Haber Process. N2(g) + 3H2(g) ⇌ 2NH3(g) Which statement is not correct? A Finely divided iron is used as a catalyst. B Hydrogen is obtained from the cracking of petroleum. C Nitrogen is obtained from the fractional distillation of crude oil. D The rate of reaction increases if a higher temperature is used.

8 CHIJSec/2025/OLevelPrelim/6092/01 21 An aqueous solution containing two salts is found. A student tests the mixture to determine which ions are present. The results are shown. test number