NYJC Prelim H2 Chem 9729 P1

[Turn Over This document consists of 15 printed pages. NANYANG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9729/01 Paper 1 Multiple Choice September 2025 1 hour 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, CT and NRIC / FIN on the Answer Sheet in the spaces provided. 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 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. H

2 H2 Chemistry 9729/01 NYJC J2/2025 PRELIM 1 X is a transition element that forms ions of various oxidation states. One ion, X 2+, reduces Cr2O72− in acid solution. If 1 mol of Cr2O72− is reduced by 2 mol of X 2+, which of the following species is formed in the reaction? A XO42− B 1 XO2+ C XO2+ D X3+ 2 M and T are cations. M contains n protons and has a charge of 3+. T contains (n–2) protons and has the same number of electrons as M. What is the formula of the oxide formed by T? A TO B T2O C T2O3 D TO2 3 The boiling point of methane is −161.5 oC while that of neon is −264 oC. Why is the boiling point of methane greater than that of neon? A Molecules of methane have a larger surface area to form stronger intermolecular forces than those of neon B A molecule of methane has more electrons than an atom of neon. C A molecule of methane has a greater relative molecular mass than an atom of neon. D Molecules of methane form hydrogen bonds, but those of neon do not. 4 Boron trifluoride is a highly reactive gas at room temperature and hence it is difficult to handle. To store it in liquid form, 2 mol of BF3 reacts with 1 mol of CH3CH2OCH2CH3 to form compound N. Which of the following statements is correct? A The boron atom in compound N has an incomplete octet. B 2 mol of AlF3 can also react with 1 mol of CH3CH2OCH2CH3 to form a similar compound. C Two dative bonds are formed from the boron atom in two BF3 molecules towards the O atom in CH3CH2OCH2CH3. D The bond angle with respect to boron atom in BF3 is bigger than the bond angle with respect to boron in compound N.

3 H2 Chemistry 9729/01 NYJC J2/2025 PRELIM 5 Which pairs of ions give an ionic compound with the lowest melting point? cation anion A P CH3 CH3 CH3 CH3 S O O O O B P CH2CH3 CH3CH2 CH2CH3 CH2CH3 S O O CH3 O C P CH3 CH3 CH3 CH