TMJC_2025_H2 Chem_P1_Answer

___________________________________________________________________ H2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 25 September 2025 1 hour Additional materials: Multiple Choice Answer Sheet Data Booklet _________________________________________________________________________ READ THESE INSTRUCTIONS FIRST Write in soft pencil. There are thirty questions in 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 separate Answer Sheet. Read the instructions on the use of the Answer Sheet very carefully. You are advised to fill in the Answer Sheet as you go along . No additional time will be given for the transfer of answers once the examination has ended. 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 16 printed pages. Use of the Answer Sheet Ensure you have written your name, class, date and subject on the Answer Sheet. Shade the last four digits of your centre/index number on the Multiple Choice Answer Sheet. (e.g. if your centre/index number is 30541234, shade 1234). Use a 2B pencil to shade your answers on the Answer Sheet; erase any mistakes cleanly. Multiple shaded answers to a question will not be accepted. TAMPINES MERIDIAN JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATION

2 Tampines Meridian Junior College 2025 JC2 Preliminary Examination H2 Chemistry 1 Use of the Data Booklet is relevant to this question. In an experiment, a sample containing phosphorus and an unknown element A is vapourised, ionised and passed through an electric field as shown below. Given that the extent of deflection for A+ is smaller than P+, which could be the identity of element A? A sulfur B silicon C sodium D nitrogen Answer: A Angle of deflection  charge mass Since the extent of deflection of X+ is smaller, this implies that X+ has a larger mass than P+. 2 Use of the Data Booklet is relevant to this question. Which particle contains the largest number of unpaired electrons? A O B Cl– C K+ D Fe Answer: D 8O: 1s22s22p4 (2 unpaired electrons) 17Cl–: 1s22s22p63s23p6 (0 unpaired electrons) 19K+: 1s22s22p63s23p6 (0 unpaired electrons) 26Fe: 1s22s22p63s23p63d64s2 (4 unpaired electrons) beam of P+ and A+ + – P+ A+

3 Tampines Meridian Junior College 2025 JC2 Preliminary Examination H2 Chemistry [Turn over 3 In a microwave oven, the microwave produced is absorbed by polar molecules. Which molecules would absorb microwave energy? 1 SO3 2 CH2F2 3 CH3CH2OH A 3 only B 1 and 2 only C 2 and 3 only D 1, 2 and 3 Answer: C SO3 ⇒ trigonal planar, non–pola