2025 H1 Chem JC2 Prelim P1 QP JPJC

© Jurong Pioneer Junior College [Turn over NAME CLASS JURONG PIONEER JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATION 2025 CHEMISTRY 8873/01 Higher 1 Paper 1 Multiple Choice Questions 18 September 2025 1 hour Candidates answer on the Question 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 thirty 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. This document consists of 13 printed pages and 3 blank pages.

2 © Jurong Pioneer Junior College 8873/01/J2 PRELIMINARY EXAMINATION /2025 1 Use of Data Booklet is relevant to this question. The atoms X and Y have the electronic configurations shown below. X, 1s2 2s2 2p6 3s2 3p6 4s2 ; Y, 1s2 2s2 2p5 Which compound are they likely to form? A X2Y B XY C XY2 D XY4 2 The trend of first ionisation energy for 10 consecutive elements, in Period 2 and 3, is given below. Which of the following statement is correct? A Element E and N belong to the same group. B L has a giant covalent structure. C The oxide of J is amphoteric. D The chloride of I is insoluble in water. E F G H I J K L M N proton number first ionisation energy

3 © Jurong Pioneer Junior College 8873/01/J2 PRELIMINARY EXAMINATION /2025 [Turn over 3 In which pair of molecules are both non–polar? 1 BeH2 and SO3 2 AlCl3 and CH4 3 PCl5 And SCl6 A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 1 only The following information is for Questions 4 and 5. Nitrotyrosine has been identified as an indicator for cell damage in the human body. N1 O O OH N2 O3 O H H H nitrotyrosine 4 What are the bond angles around N1, N2 and O3 of nitrotyrosine? Bond angle / ° N1 N2 O3 A 105 107 120 B 105 120 105 C 120 120 120 D 120 107 105 5 Which of the following functional groups can be found in nitrotyrosine? You may refer to the structure above. 1 Amide 2 Amine 3 Carboxylic acid A 1, 2 and 3 only B 1 and 2 only C 2 and 3 only D 3 only

4 © Jurong Pioneer Junior College 8873/01/J2 PRELIMINARY EXAMINATION /2025 6 Which row correctly describes the structure and bonding present in the solid lattice of the given substance? substance structure bonding A iodine simple covalent instantaneous dipole–induced dipole only B iron giant metallic ionic bonding only C sodium carbonate giant ionic ionic and covalent bonding D graphite giant molecular covalent bonding only 7 Arrange the following compounds in ascending order of boiling point. Compound Formula Mr P CH3CH2CH2CH3 58 Q CH3COCH3 58 R CH3CH(CH3)2 58 S CH3CH2CH2OH 60 A P → Q → R → S B Q → S → P → R C R → P → Q → S D S → P → R → Q 8 Which of the following statements can be explained by the presence of intermolecular hydrogen bonding only. 1 Ice is less dense than water. 2 Dimerisation of ethanoic acid in hexane. 3 Dissolution of sodium chloride in water. A 1 and 2 only B 2 and 3 only C 1 only D 3 only

5 © Jurong Pioneer Junior College 8873/01/J2 PRELIMINARY EXAMINATION /2025 [Turn over 9 Use of Data Booklet is relevant to this question. The maximum tolerable daily intake of ascorbic acid, also known as vitamin C, for adults is 2000 mg, beyond which there may be adverse effects on the human body. What is the number of molecules in 2000 mg of ascorbic acid, C6H8O6? A 6.84 x 1018 B 1.20 x 1024 C 6.84 x 1021 D 1.20 x 1027 10 1 mol of acidified Cr 2O72– reacted with 3 mol of Mn 2+. The products are Cr3+ and a manganese cation, of an unknown oxidation state. What is the oxidation state of the manganese cation? A +3 B +4 C +5 D +6 11 Sodium azide, NaN3, is the compound that inflates the airbags in a car in event of a collision. However, it produces sodium as a byproduct. 2NaN3 → 2Na + 3N2 To ensure that the sodium does not add further injuries to people, potassium nitrate, KNO3, is added in excess to the sodium azide. 10Na + 2KNO3 → K2O + 5Na2O + N2 What is the volume of nitrogen gas, at r.t.p., obtained when an airbag, containing 0.100 mol of sodium azide, is activated? A 1500 cm3 B 1600 cm3 C 3600 cm3 D 3840 cm3 12 The following statements describes the behaviour of an element, T, in Period 3 of the Periodic Table. Three of the statements describing the behaviour of element T are true and one is false. Which of the statements is false? A T has a lower ionisation energy than the element before it. B T has a larger atomic radius than the element after it. C T forms an oxide that is insoluble in water. D T can react with chlorine to form TCl5.

6 © Jurong Pioneer Junior College 8873/01/J2 PRELIMINARY EXAMINATION /2025 13 The properties of Period 3 elements and their compounds are plotted against increasing atomic number. Which of the following graphs is incorrect? A B C D 14 Which statements about Group 17 elements and their compounds are correct? 1 The first ionisation energy of the atoms decreases down the group. 2 The oxidising power of the halogens decreases down the group. 3 The boiling point of the hydrogen halides decreases down the group. A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 1 only 15 Which equation corresponds to the enthalpy change stated? A CH4(g) → C(g) + 4H(g) Bond energy(C–H) B 2H2(g) + O2(g) → 2H2O(l) ∆Hocombustion(H2) C 2Na(s) + C(s) + O3(g) → Na2CO3(s) ∆Hoformation(Na2CO3) D ½H2SO4(aq) + ½Ba(OH)2(aq) → ½BaSO4(aq) + H2O(l) ∆Honeutralisation 11 12 13 14 15 16 pH of oxide in water melting point of element ionic radii

7 © Jurong Pioneer Junior College 8873/01/J2 PRELIMINARY EXAMINATION /2025 [Turn over 16 Use of the Data Booklet is relevant to this question. An experiment was conducted to determine the enthalpy change of solution of ammonium nitrate, NH4NO3. A styrofoam cup was filled with 50.0 g of water and the temperature of the water was measured at intervals of 1 minute . At 2 minutes, 6.50 g of NH4NO3 was added and the temperature of the mixture was recorded every minute. The following graph was obtained. What is the enthalpy change of solution of ammonium nitrate, NH4NO3? A –25.7 kJ mol–1 B –24.1 kJ mol–1 C +25.7 kJ mol–1 D +24.1 kJ mol–1 Temperature / °C Time / minute

8 © Jurong Pioneer Junior College 8873/01/J2 PRELIMINARY EXAMINATION /2025 17 The graph shows the Boltzmann distribution for a sample of gas at 298 K. Which of the following describes what would happen to the graph when a catalyst is added? A The maxima of the graph shifts up. B The maxima of the graph shifts to the left. C The maxima of the graph shifts to the right. D The maxima of the graph does not change. 18 In many countries, it is mandatory to install catalytic converters in motor vehicles to remove pollutants from the exhaust gases. Which of these substances are not removed by the catalytic converters? A CO B CO2 C NO2 D C8H18