EJC 2026 Prelim P1 QP

© EJC [Turn Over EUNOIA JUNIOR COLLEGE JC2 Preliminary Examination 2026 General Certificate of Education Advanced Level Higher 2 CHEMISTRY Paper 1 Multiple Choice 9476/01 18 September 2026 1 hour Additional Materials: Multiple Choice Answer Sheet 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. Write in soft pencil. Write your name, civics group and registration number on the Answer Sheet in the spaces provided unless this has been done for you. Do not use correction fluid or tape. The use of an approved scientific calculator is expected, where appropriate. The total mark for this paper is 30. Each correct answer will score one mark. Any rough working should be done in this question paper. This document consists of 12 printed pages.

2 © EJC 9476/01/J2PRELIM/26 1 The shape of two atomic orbitals is shown. s p Which statement correctly describes these orbitals? A All s orbitals are circular in shape. B There are five occupied p orbitals in an atom with atomic number 15. C A  bond can be formed by the sideway overlap of 2px orbital on one atom and a 2py orbital on an adjacent atom. D A  bond can be formed by the head -on overlap of two p orbitals and has electron density along the internuclear axis. 2 Use of the Data Booklet is relevant to this question. Which compound consists of a cation and an anion that does not contain the same number of electrons as each other? A LiH B NaOH C NH4F D ZnCO3 3 For the following chlorine-containing species, ClO3−, ICl2−, PCl4+ Which statements are correct? 1 All atoms achieve stable octet configuration. 2 ClO3− is trigonal pyramidal, ICl2− is linear, while PCl4+ is tetrahedral. 3 The bond angles increase in the order: ClO – 3 < PCl4+ < ICl2−. A 1, 2 and 3 B 2 and 3 only C 1 only D 2 only 4 Which of the following substances is least soluble in dilute NaOH(aq)? A SiO2 B P4O10 C Na2O D Al2O3

3 © EJC 9476/01/J2PRELIM/26 [Turn Over 5 20.0 cm 3 of 0.02 mol dm –3 aqueous sodium bromate( V), NaBrO 3, was found to react completely with 80.0 cm3 of 0.01 mol dm–3 hydroxylamine, NH2OH. The half equation for the reduction of bromate(V) ion is shown. BrO – 3(aq) + 6H+(aq) + 6e− → Br−(aq) + 3H2O(l) What could be the nitrogen-containing product of this reaction? A NO B NO2 C N2O D NO – 3 6 Which factor is the most significant in explaining the non -ideal behaviour of the gases present in the reaction chamber in the Haber process? A the presence of a catalyst B the high pressure of 250 atm C the high temperature of 450 oC D strong bonds between the atoms in nitrogen molecules 7 Which equation shows the first reactant acting as a Bronsted–Lowry acid? A O2– + H2O → 2OH– B H2S + SO2 → 2H2O + 3S C C6H5OH + OH– → C6H5O− + H2O D HNO3 + H2SO4 → H2NO3+ + HSO4– 8 Use of the Data Booklet is relevant to this question. Which property decreases from sodium to aluminium and also from aluminium to phosphorus? A melting point of the oxide B melting point of the element C electrical conductivity of the element D pH of the resulting solution when the chloride is added to water

4 © EJC 9476/01/J2PRELIM/26 9 X and Y are both elements in Period 3. Each element forms a stable monoatomic ion. The atomic radius and ionic radius of each element are shown in the table. element atomic radius / nm ionic radius / nm X 0.160 0.065 Y 0.104 0.184 Which statement is correct? A Y has a higher melting point than X. B Y has a higher first ionisation energy than X. C The chloride of X has a lower melting point than the oxide of Y. D The ion of X has more occupied principal quantum shells than the ion of Y. 10 Most elements contain more than one isotope; atoms that have the same chemical properties but different masses. Which expression correctly defines the term relative atomic mass of an element? A the mass of 1 atom of an element relative to the mass of 1 12 the mass of 1 atom of 12C B the mass of 1 mole of atoms of an element divided by 6.02 × 1023 C the mass of 1 mole of atoms of an element relative to the mass of 1 12 the mass of 1 atom of 12C D the mass of 1 mole of atoms of an element relative to the mass of 1 12 the mass of 1 mole of 12C atoms 11 At 1 atm pressure, the enthalpy change of vapourisation of water is +40.7 kJ mol−1 at its boiling point (100 °C). What is the entropy change when 54 g of water boils at 100 °C and 1 atm? A +327 J mol–1 K–1 B +109 J mol–1 K–1 C –109 J mol–1 K–1 D –327 J mol–1 K–1

5 © EJC 9476/01/J2PRELIM/26 [Turn Over 12 Solid sodium chloride dissolves readily in water at room temperature. During the process, the temperature of the solution decreases. Which statements are correct? 1 S is positive for dissolution of sodium chloride. 2 Dissolution of sodium chloride is more spontaneous as temperature increases. 3   hydLE H for dissolution of sodium chloride. A 1 only B 1 and 2 only C 2 and 3 only D 1, 2 and 3 13 The reaction between P and Q is catalysed by U and can be represented by the following equation: P(aq) + Q(aq) ⎯→ X(aq) + Y(aq). The rate of the reaction can be studied by measuring the time taken for a fixed amount of Q to react. In one such investigation at 20 °C, four experiments were carried out and the results are shown. [Q] = 2s mol dm-3 [Q] = s mol dm-3 experiment 1 2 3 4 volume of P / cm3 20.0 10.0 20.0 20.0 volume of Q / cm3 4.0 4.0 4.0 4.0 volume of U / cm3 20.0 20.0 20.0 10.0 volume of water / cm3 0.0 10.0 0.0 10.0 time taken for Q to react / s 38 74 19 37 What are the orders of reaction with respect to P, Q and U respectively? P Q U A 1 0 1 B 1 1 0 C 1 1 1 D 1 0 2

6 © EJC 9476/01/J2PRELIM/26 14 The diagram represents the Boltzmann distribution of molecular energies at a given temperature. As temperature increases, which statements are correct? 1 The maximum of the curve is displaced to the right. 2 The proportion of molecules with energies above any given value increases. 3 The proportion of molecules with any given energy increases. A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 1 only 15 Industrial coal gasification involves two simultaneous equilibria at 800 K. C(s) + H2O(g) ⇌ CO(g) + H2(g) Kp(1) = 8.0 atm CO(g) + H2O(g) ⇌ CO2(g) + H2(g) Kp(2) = 1.0 Excess solid carbon and steam are placed in a closed reactor. At equilibrium, the partial pressure of carbon dioxide is found to be 0.20 atm. What is the equilibrium partial pressure, in atm, of carbon monoxide? A 1.60 B 1.26 C 0.400 D 0.200 proportion of molecules energy 0

7 © EJC 9476/01/J2PRELIM/26 [Turn Over 16 X and Y were mixed in a 1 dm3 vessel and the whole system was allowed to reach equilibrium at temperature T K, as represented by the following equation: X(g) + Y(g) ⇌ 2Z(g) The concentrations of all gases were measured at one-minute intervals and the operating conditions were altered at the 4th and the 7th minute. The effects are shown in the graph. Which of the following can be inferred from the given information? A The equilibrium constant, Kc, is 4.0 at the 3rd minute. B 0.05 mol of Y was added at constant volume at the 4th minute. C The volume of the vessel was decreased at the 7th minute. D The forward reaction rate was faster than the reverse reaction rate at the 8th minute.

8 © EJC 9476/01/J2PRELIM/26 17 The pKa of lactic acid is 3.85 at 298 K. A buffer solution contains 1.5 mol dm−3 lactic acid and 0.5 mol dm−3 sodium lactate. Which statement co