ACJC 2026 Prelim P1 Ans

This document consists of 21 printed pages and 1 blank page. Anglo-Chinese Junior College JC2 Chemistry Preliminary Examinations Higher 2 CANDIDATE NAME FORM CLASS INDEX NUMBER SUBJECT TUTOR CHEMISTRY Paper 1 Multiple Choice You must answer on the multiple choice answer sheet. You will need: Multiple choice answer sheet Data Booklet Soft clean eraser Soft pencil (type B or HB is recommended) 9476/01 16 September 2026 1 hour INSTRUCTIONS • 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. • Write your name, centre number and index number on the multiple choice answer sheet in the spaces provided unless this has been done for you. • Do not use correction fluid or tape. • Do not write on any bar codes. • You may use an approved calculator. INFORMATION • The total mark for this paper is 30. • Each correct answer will score one mark. • Any rough working should be done on this question paper.

2 ACJC2026 9476/JC2 Preliminary Examination/2026 [Turn over 1 B 6 A 11 A 16 D 21 D 26 A 2 A 7 C 12 A 17 C 22 D 27 C 3 D 8 D 13 C 18 C 23 A 28 B 4 B 9 A 14 B 19 C 24 D 29 D 5 B 10 D 15 D 20 B 25 B 30 C 1 Iron(II) ethanedioate can be oxidised by manganate( VII) ions using the sequence of reactions shown. MnO4‒ + 8H+ + 5e‒ → Mn2+ + 4H2O Fe2+ → Fe3+ + e‒ C2O42‒ → 2CO2 + 2e‒ What volume of 0.01 mol dm‒3 KMnO4 is required to oxidise 15 cm 3 of an acidified solution of 0.01 mol dm‒3 FeC2O4? A 6 cm3 B 9 cm3 C 15 cm3 D 25 cm3 Answer: B Amount of Fe2+ = amount of C2O42‒ = 0.01 × 15 1000 mol When both 1 mol Fe2+ and 1 mol C2O42‒are oxidized, 3 mol of electrons are produced. Amount of electrons produced = 0.01 × 15 1000 × 3 mol Amount of MnO4‒ = 0.01 × 151000 × 35 mol Let volume of KMnO4 be V cm3. 0.01 × 𝑉 1000 = 0.01 × 15 1000 × 3 5 mol V = 9 cm3 2 An organic compound E contains only carbon, hydrogen, and oxygen. Complete combustion of 1.50 g of E in excess oxygen produces 2.20 g of carbon dioxide gas and 0.90 g of liquid water. What is the empirical formula of E? A CH2O B C2H4O C CHO D C2H2O

3 Answer: A Amount of CO2 = 2.20/44.0 = 0.0500 mol = Amount of C Mass of C = 0.0500 x 12.0 = 0.600 g Amount of H2O = 0.90/18.0 = 0.0500 mol Amount of H = 2 x Amount of H2O = 0.100 mol Mass of H = 0.100 x 1.0 = 0.100 g By law of conservation of mass, Mass of O = 1.50 – 0.100 – 0.600 = 0.800 g Amount of O = 0.800/16.0 = 0.0500 mol Mole ratio of C : H : O = 0.05 : 0.1 : 0.05 = 1 : 2 : 1 Empirical formula is CH2O 3 Use of the Data Booklet is relevant to this question. Which ion has the greatest angle of deflection in an electric field? A S2− B Br− C F− D O2− Answer: D The ratio of charge : mass the oxide ion is the highest amongst the four, so it has the largest angle of deflection in an electric field. 4 The successive ionisation energies (IE) of two elements, M and N, are shown. IE / kJ mol–1 1st 2nd 3rd 4th 5th 6th 7th 8th M 550 1065 4138 5500 6910 8760 10230 11800 N 1140 2103 3470 4560 5760 8550 9940 18600 What is the likely compound formed between M and N? A MN B MN2 C M2N D M3N2 Answer: B M shows the largest increase from the 2nd to 3rd IE, so it has 2 valence electrons and it is from group 2. N shows the largest increase from the 7th to 8th IE, so it has 7 valence electrons and it is from group 17. M2+ and N– ions form MN2.

4 ACJC2026 9476/JC2 Preliminary Examination/2026 [Turn over 5 Which statement best describes a metallic bond? A It is the electrostatic attraction between valence electrons and positive nuclei. B It is the electrostatic attraction between delocalised electrons and positive ions. C It is the electrostatic attraction between valence electrons and positive ions. D It is the electrostatic attraction between delocalised electrons and positive nuclei. Answer: B Metallic bonding is the electrostatic attraction between the positively charged cation and sea of delocalized electrons. 6 Which statement is a basic assumption of the kinetic theory of gases as applied to an ideal gas? A The intermolecular forces of attraction between gas molecules are negligible under all conditions of temperature and pressure. B Gas molecules are in continuous, random motion, and all collisions between molecules are inelastic. C The volume of gas is insignificant compared to the volume of the gas molecules. D The average kinetic energy of the gas molecules is directly proportional to the temperature in degrees Celsius (°C). Answer: A B is incorrect: Collisions between ideal gas molecules are assumed to be perfectly elastic (meaning total kinetic energy is conserved during a collision), rather than inelastic. C is incorrect: The theory assumes that the actual volume occupied by the gas molecules is negligible compared to the empty space of the container. D is incorrect: The average kinetic energy of the particles is directly proportional to the absolute temperature in Kelvin, not in degrees Celsius. 7 For the oxides of Period 3 elements, which property decreases from Na2O to P4O10? A covalent character B melting point C pH when mixed with water D solubility in aqueous alkali Answer: C

5 8 Three charts show the variation of three physical properties for the Period 3 elements. Which row is correct? physical property 1 physical property 2 physical property 3 A ionic radius electrical conductivity melting point B electrical conductivity melting point ionic radius C melting point ionic radius electrical conductivity D melting point electrical conductivity ionic radius Answer: D Chart 1 (Melting Point): Silicon has highest mp. Na, Mg, Al as a group has the second highest mp. P4, S8 and Cl2 as a group has the lowest mp. physical property 2 Na Mg Al Si P S Cl physical property 1 Na Mg Al Si P S Cl physical property 3 Na Mg Al Si P S Cl

6 ACJC2026 9476/JC2 Preliminary Examination/2026 [Turn over Chart 2 (Electrical Conductivity): Na, Mg, Al as a group has the highest electrical conductivity. Silicon is a semi-conductor. P4, S8 and Cl2 as a group has the lowest electrical conductivity. Chart 3 (Ionic Radius): Na+, Mg2+, Al3+ and Si4+ as a group has the smallest ionic radii. P3−, S2− and Cl− as a group has the lowest electrical conductivity. 9 Radium is the last element in Group 2 in the Periodic Table. Which statement is not true for radium? A It is the least reactive element in Group 2. B It reacts with water to release hydrogen gas. C It forms a basic oxide. D Its carbonate has the highest thermal stability in Group 2. Answer: A Down the group, Eo values of Group 2 metals become more negative, so reducing strength increases. 10 The table below shows the bond energies and bond lengths of several carbon-halogen bonds. bond bond energy /kJ mol–1 bond length / nm C – F 485 0.138 C – Cl 340 0.177 C – Br 280 0.193 C – I 240 0.214 Based on these data and your chemical knowledge, which statement correctly pairs the relative reactivity of halogenoalkanes towards nucleophilic substitution with its corre