JPJC Prelim 2025 Paper 1 QP_H2 Chem

© Jurong Pioneer Junior College [Turn Over NAME CLASS 24S JURONG PIONEER JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATION 2025 CHEMISTRY 9729/01 Higher 2 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 12 printed pages.

2 © Jurong Pioneer Junior College 9729/01/J2 PRELIM EXAM/2025 1 A vessel, at standard temperature and pressure, contains a mixture of 35Cl2 and 37Cl2. The gaseous mixture occupies a volume of 5.7 dm3, and has a mass of 18.0 g. What is the percentage by mass of 35Cl2 in the mixture? A 25 % B 40 % C 60 % D 75 % 2 A stable ion of E has the following properties: • has a noble gas configuration • was obtained by removing electrons from the same orbital Which of the following could be E? A Al B Ca C Cu D S 3 Trifluorooxonium has the formula OF3n+ and its shape is trigonal pyramidal. What is the value of n in trifluorooxonium? A 1 B 2 C 3 D 4 4 A mixture of 10 cm3 of methane and 20 cm3 of ethane was sparked with an excess of oxygen. After cooling, the residual gas was passed through aqueous potassium hydroxide. All gas volumes were measured at the same temperature and pressure. Which volume of gas was absorbed by the alkali? A 20 cm3 B 30 cm3 C 50 cm3 D 100 cm3 5 An ion of metal G can be oxidised by potassium manganate(VII) in acid solution to form GO3−. In an experiment, 1.25  10−3 mol of the ion of G required 37.5 cm 3 of 0.0200 mol dm −3 potassium manganate(VII) for complete reaction. What is the initial oxidation state of the ion of G given that potassium manganate( VII) is reduced to Mn2+? A +1 B +2 C +3 D +4

3 © Jurong Pioneer Junior College 9729/01/J2 PRELIM EXAM/2025 [Turn Over 6 The value of pV is plotted against p for two gases, J and L, where p is the pressure and V is the volume of the gas. Which of the following could be the identities of the gases? Gas J Gas L 1 0.5 mol of N2H2 at 25 C 0.5 mol of H2 at 75 C 2 0.5 mol of NH3 at 25 C 1.5 mol of CH4 at 25 C 3 0.25 mol of