ASR 2020 J2Prelim H2Chem P1 QP

ASRJC JC2 PRELIM 2020 9729/01/H2 [Turn over ANDERSON SERANGOON JUNIOR COLLEGE 2020 JC 2 PRELIMINARY EXAMINATION CHEMISTRY 9729/01 Paper 1 Multiple Choice 23 September 2020 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 and class on the Answer Sheet in the spaces provided. There are thirty questions on 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. This document consists of 16 printed pages. Multiple Choice Answer Sheet Write your name, class and NRIC / FIN number, including the reference letter. Shade the NRIC / FIN number. Exam Title: JC2 Preliminary Exam Exam Details: H2 Chemistry / Paper 1 Date: 23/09/2020

2 ASRJC JC2 PRELIM 2020 9729/01/H2 1 Beams of charged particles are deflected by an electric field. In an experiment, protons are deflected by an angle of +15º. In another experiment, under identical conditions, particle A is deflected by an angle of –5º. What could be the composition of particle A? protons neutrons electrons A 1 2 2 B 3 3 2 C 3 3 4 D 4 5 1 2 50 cm 3 of a 0.10 mol dm –3 solution of a metallic salt was found to react exactly with 25.0 cm3 of 0.10 mol dm–3 aqueous sodium sulfite. In this reaction, the sulfite ion is oxidised as follows. SO32–(aq) + H2O(l)  SO42–(aq) + 2H+(aq) + 2e What is the new oxidation number of the metal in the salt if its original oxidation number was +3? A +1 B +2 C +4 D +5 3 Which particle would, on losing two electrons, have a half–filled p subshell? A Ga– B Se– C Te+ D As2+

3 ASRJC JC2 PRELIM 2020 9729/01/H2 [Turn over 4 The successive ionisation energies (I.E.) of two elements, B and C, are shown below. I.E. / kJ mol–1 1st 2nd 3rd 4th 5th 6th 7th 8th B 1000 2252 3357 4556 7004 8496 27107 31719 C 578 1817 2745 11577 14842 18379 23326 27465 What is the likely formula of the compound formed when B and C reacts together?