JPJC 2025 H2 Chemistry Promos P1

© Jurong Pioneer Junior College [Turn Over NAME CLASS 25S JURONG PIONEER JUNIOR COLLEGE JC1 YEAR END EXAMINATION 2025 CHEMISTRY 9476/01 Higher 2 Paper 1 Multiple Choice 2 October 2025 45 minutes Candidates answer on separate paper. Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and exam index number on the Answer Sheet in the spaces provided unless this has been done for you. There are twenty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C or 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 in this booklet. The use of an approved scientific calculator is expected, where appropriate.

2 © Jurong Pioneer Junior College 9476/01/J1 YEAR END EXAM/2025 This document consists of 8 printed pages and 0 blank page. 1 Use of the Data Booklet is relevant to this question. Which particle has more protons than electrons and more protons than neutrons? (D = 2 1H ) A OD− B NH2− C H3O+ D D3O+ 2 Use of the Data Booklet is relevant to this question. Element X shows a very large increase between its 6 th and 7th ionisation energies. It has the largest 1st ionisation energy in its group. What is the atomic symbol of element X? A F B Ts C O D Lv 3 Which row about the shapes of NH3 and SCl2 is correct? shape of NH3 shape of SCl2 A trigonal pyramidal bent B trigonal pyramidal linear C trigonal planar bent D trigonal planar linear 4 The diagram shows the structure of compound Y. Y C N Which row is correct about the number of  and  bonds in one molecule of Y? number of  bonds in Y number of  bonds in Y A 2 1 B 5 1 C 5 3 D 6 3

3 © Jurong Pioneer Junior College 9476/01/J1 YEAR END EXAM/2025 [Turn Over 5 The element tin exists in two forms, grey tin and white tin. Some properties of grey tin and white tin are shown. grey tin white tin boiling point / K 2543 2533 electrical conductivity none in solid or liquid good in solid and liquid Which structural change might take place when grey tin changes to white tin? A giant covalent to giant ionic B giant covalent to giant metallic C giant ionic to giant covalent D giant ionic to giant metallic 6 Which statements describe a phenomenon which can be explained by hydrogen bonding? 1 Ice floats on water. 2 Ethanoic acid molecules form dimers when dissolved in benzene. 3 The boiling points of hydrogen halides increase from HCl to HI. A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 3 only 7 Under which conditions will the behaviour of a gas be most ideal? pressure temperature A high high B high low C low high D low low

4 © Jurong Pioneer Junior College 9476/01/J1 YEAR END EXAM/2025 8 Which graph best represents the behaviour of a fixed mass of ideal gas at constant temperature? ( refers to the density of the gas) A B C D 9 A sample of sulfur contains three naturally occurring isotopes, 32S, 33S and 34S. The sample is made up of 90.00 % of 32S and 2.50 % of 33S. What is the relative atomic mass, to 2 decimal places, of sulfur in this sample? A 32.35 B 32.18 C 32.10 D 30.27 10 Use of the Data Booklet is relevant to this question. How many P atoms are present in 62 g of solid white phosphorus, P4? [L is the Avogadro constant.] A 2L B L C 2 L D 4 L V P V  P V

5 © Jurong Pioneer Junior College 9476/01/J1 YEAR END EXAM/2025 [Turn Over 11 Use of the Data Booklet is relevant to this question. The lattice energies of Group 1 compounds caesium chloride, caesium fluoride, sodium chloride and sodium fluoride are given in the options below. Which value, in kJ mol−1, correspond to the lattice energy of sodium fluoride? A −661 B −747 C −780 D −918 12 The uncatalysed reaction between SO2 and O2 is slow. 2SO2 + O2 → 2SO3 The reaction is sped up in the presence of the homogeneous catalyst NO, which participates as follows. 2NO + O2 → 2NO2 2NO2 + 2SO2 → 2NO + 2SO3 Which reaction pathway diagram is most appropriate for describing the enthalpy changes occurring during the catalysed reaction? In each case the reaction pathway for the uncatalysed reaction is shown as a dashed line. A B C D

6 © Jurong Pioneer Junior College 9476/01/J1 YEAR END EXAM/2025 13 Amoxicillin is a drug used to treat infections. The breakdown of amoxicillin in the blood is a first −order reaction. An original concentration of amoxicillin of 15.00 mg dm−3 decreases to 1.875 mg dm−3 after 183 minutes. How many minutes will it take for a concentration of amoxicillin in the blood to decrease from 10.00 mg dm−3 to 2.50 mg dm−3? A 61 B 91.5 C 122 D 244 14 The reaction between potassium manganate(VII) and ethanedioic acid is an example of auto−catalysed reaction, in which one of the products catalyses the reaction. 2MnO4− + 5H2C2O4 + 6H+ → 2Mn2+ + 10CO2 + 8H2O Which graph correctly represents the kinetics of this reaction? A B C D time rate time rate time rate time rate

7 © Jurong Pioneer Junior College 9476/01/J1 YEAR END EXAM/2025 [Turn Over 15 Gaseous hydrogen and gaseous iodine react to form gaseous hydrogen iodide. H2(g) + I2(g) ⇌ 2HI(g) In an experiment, 2.0 mol of hydrogen and 2.0 mol of iodine are placed in a sealed container of volume 2.0 dm3. The Kc value for this reaction under the conditions used is 9.0. How many moles of hydrogen iodide are present at equilibrium? A 0.57 mol B 1.2 mol C 1.5 mol D 2.4 mol 16 Which changes in conditions would result in no change in the value of equilibrium constant for the following reaction? N2(g) + 3H2(g) ⇌ 2NH3(g) H = −92 kJ mol−1 1 increasing the concentration of N2 2 adding an inert gas under constant volume 3 adding a catalyst A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 1 only 17 Constitutional isomerism only should be considered when answering this question. How many straight chain isomers are there with molecular formula C4H8Cl2? A 6 B 7 C 8 D 9 18 How many stereoisomers are there with this structural formula of compound Z? compound Z OH O OH A 2 B 4 C 6 D 8

8 © Jurong Pioneer Junior College 9476/01/J1 YEAR END EXAM/2025 19 Which of the following are the possible products formed when but−1−ene reacts with bromine dissolved in aqueous sodium chloride? 1 Br OH 2 3 OH Cl 4 A 1, 2 and 3 only B 1, 2 and 4 only C 1 and 4 only D 2 and 3 only 20 Which structure is not formed when 2−methylpentan−3−ol is heated with concentrated H3PO4? OH 2-methylpentan-3-ol A B C D