NYJC Prelim H1 Chem 8873 P1

[Turn Over This document consists of 15 printed pages. NANYANG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 1 CHEMISTRY 8873/01 Paper 1 Multiple Choice 22 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.

2 H1 Chemistry 8873/01 NYJC J2/2025 PRELIM 1 X, Y and Z are different sub-atomic particles. X has a mass of 9.11 × 10−31 kg and Y has a mass of 1.67 × 10−27 kg. Z is not deflected when passed through an electric field. What could be the identities of X, Y and Z? X Y Z A electron neutron proton B electron proton neutron C proton electron neutron D proton neutron electron 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 When aqueous copper(II) sulfate is mixed with potassium iodide, a white precipitate of CuI in a brown solution is formed. What is the electronic configuration of the copper cation in the white precipitate? A 1s2 2s2 2p6 3s2 3p6 3d9 B 1s2 2s2 2p6 3s2 3p6 3d7 4s2 C 1s2 2s2 2p6 3s2 3p6 3d10 D 1s2 2s2 2p6 3s2 3p6 3d9 4s1

3 H1 Chemistry 8873/01 NYJC J2/2025 PRELIM [Turn Over 4 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. 5 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 BF 3 reacts with 1 mol of CH 3CH2OCH2CH3 to form compound N. Which statement 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 tw