HCI 2026 Prelim P1 QP

This document has 14 pages. Any blank pages are indicated. HWA CHONG INSTITUTION C2 Preliminary Examination Higher 2 CANDIDATE NAME CT GROUP 2 5 S CENTRE NUMBER S INDEX NUMBER CHEMISTRY Paper 1 Multiple Choice 9476/01 21 September 2026 1 hour You must answer on the multiple choice answer sheet. You will need: Multiple choice answer sheet Soft clean eraser Soft pencil (type B or HB is recommended) Data Booklet READ THESE INSTRUCTIONS FIRST • There are thirty 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 multiple choice answer sheet. • Follow the instructions on the multiple choice answer sheet. • Write in soft pencil. • Do not use correction fluid or tape. • Do not write on any bar codes. • You may use an approved calculator. • Complete the information on the multiple choice answer sheet as shown below. INFORMATION • The total mark for this paper is 30. • Each correct answer will score one mark. • Any rough working should be done in this booklet.

2 © Hwa Chong Institution 2026 9476/01/C2 Preliminary Examination [Turn Over 1 I, II and III represent three different structures of an element. I II III Which structures are giant molecular? A I and II only B I and III only C II and III only D I, II and III 2 Equal masses of nitrogen and ethene gas were contained in separate vessels of identical volume at the same temperature. The vessels were connected by a valve of negligible volume. When the valve was opened, the two gases mixed completely without any change in temperature. Assume that nitrogen, ethene and the gaseous mixture behave ideally. Which statement is correct in relation to the gaseous mixture? A The average Mr of the gaseous mixture is 21.0. B The average kinetic energy of the gaseous particles changed upon mixing. C The partial pressure of nitrogen is the same as the partial pressure of ethene. D The density of the gaseous mixture is the sum of the original densities of the nitrogen and ethene.

3 © Hwa Chong Institution 2026 9476/01/C2 Preliminary Examination [Turn Over 3 The diagram shows how pV / RT varies when pressure p is changed for 1 mole of an ideal gas (Graph 3) and 1 mole of a particular real gas (Graphs 1 and 2) at different temperatures. Which statements are correct? 1 At point X, the pressure is moderately high and intermolecular forces of attraction are significant, hence the gas occupies a smaller volume than that predicted by the general gas equation. 2 Graphs 1 and 2 could be obtained at the temperatures of 200 °C and 400 °C respectively. A 1 only B 2 only C 1 and 2 D neither 1 nor 2 4 Use of the Data Booklet is relevant to this question. In which set of reactants will a Lewis acid react completely with excess Lewis base to form a product with a molar mass greater than 100 g mol−1? 1 CH3CH2+ and Br− 2 BeCl2 and NH3 A 1 only B 2 only C 1 and 2 D neither 1 nor 2 pV / RT p

4 © Hwa Chong Institution 2026 9476/01/C2 Preliminary Examination [Turn Over 5 The volatility of the series of substances BrX, where X is chlorine, bromine or iodine, follows a similar trend to the volatility of the halogens down Group 17. Which statement is correct? A The boiling point of BrCl is higher than that of BrI as BrCl is a more polar molecule. B The boiling point of BrI is higher than that of BrCl as there are more electrons in each molecule of BrI. C The boiling point of BrCl is higher than that of Br2 as the Br−Cl bond is stronger than the Br−Br bond. D BrI is a gas at room temperature and pressure. 6 E is the number of Period 2 elements which have two orbitals among its occupied shells which contain just one electron. F is the number of Period 2 elements which have two orbitals among its occupied shells which contain a pair of electrons. Which row is correct? E F A 2 3 B 2 4 C 3 3 D 3 4

5 © Hwa Chong Institution 2026 9476/01/C2 Preliminary Examination [Turn Over 7 Which graph does not show the correct trend in the stated property for the elements in the third period of the Periodic Table? A B C D 8 Use of the Data Booklet is relevant to this question. Acidified potassium manganate(VII) reacts with iron(II) ethanedioate, FeC2O4. The half-equation involving ethanedioate is given below. C2O42– ⇌ 2CO2 + 2e– How many moles of iron( II) ethanedioate react with two moles of potassium manganate(VII)? A 5.00 B 3.33 C 0.30 D 0.20 9 G is an organic compound that contains carbon, hydrogen and oxygen only. 15.0 cm3 of gaseous G is exploded with an excess of oxygen. A contraction of 30.0 cm3 in volume occurs after the combustion. On passing the gaseous products through aqueous sodium hydroxide, a further contraction of 75.0 cm3 occurs. What is the molecular formula of G? (All volumes were measured at r.t.p.) A C5H6O B C5H6O3 C C2H4O D C2H6O element element element element element

6 © Hwa Chong Institution 2026 9476/01/C2 Preliminary Examination [Turn Over 10 Which processes result in an increase in entropy of the system? 1 the electrolysis of water 2 heating water from 30°C to 60 °C 3 evaporating a beaker of water A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3 11 Hydrogen peroxide reacts with acidified iodide ions according to the following equation. H2O2(aq) + 2H+(aq) + 2I−(aq) → I2(aq) + 2H2O(l) The rate of reaction can be investigated by monitoring the increase in concentration of iodine formed over time. The reaction is zero order with respect to [H+]. The following results were obtained by varying the initial concentrations of hydrogen peroxide and iodide ions. Expt initial [H2O2] / mol dm−3 initial [I−] / mol dm−3 initial rate / mol dm−3 min−1 1 0.02 0.04 1.2 × 10−4 2 0.02 0.05 1.5 × 10−4 3 0.05 0.06 4.5 × 10−4 Which statement is correct? A The rate constant is 0.15 mol−1 dm3 min−1. B The order of reaction with respect to [H2O2] is 2. C The half-life of H2O2 is constant in experiments 1, 2 and 3. D H+ is a reactant in the rate-determining step of the reaction mechanism.

7 © Hwa Chong Institution 2026 9476/01/C2 Preliminary Examination [Turn Over 12 Use of the Data Booklet is relevant to this question. Iodide ions react with peroxodisulfate ions according to the following reaction. 2I−(aq) + S2O82−(aq) → I2(aq) + 2SO42−(aq) reaction 1 Reaction 1 is catalysed by Fe2+(aq) ions in a two-step pathway, where each step is spontaneous. step 1: 2Fe2+(aq) + S2O82−(aq) → 2Fe3+(aq)+ 2SO42−(aq) step 2: 2Fe3+(aq) + 2I−(aq) → 2Fe2+(aq) + I2(aq) Which statements are correct? 1 Fe3+(aq) ions are also a suitable catalyst for the reaction. 2 Co2+(aq) ions are also a suitable catalyst for the reaction. 3 The enthalpy change of reaction 1 is more negative with the addition of the catalyst. A 1 only B 1 and 2 only C 2 and 3 only D 1, 2 and 3 13 Solids Q and R dissolve readily in water. Some solid Q and R were dissolved in water and the reaction was allowed to reach equilibrium. Q(aq) + R(aq) ⇌ S(aq) + T(aq) ∆H < 0 The concentration of Q was investigated over time. At t1, some solid Q was added into the reaction mixture. At t2, the temperature of the reaction mixture was increased. Which graph shows the correct variation of the concentration of Q over time? A B C D

8 © Hwa Chong Institution 2026 9476/01/C2 Preliminary Examination [Turn Over 14 The statements refer to the value of the