ACJC_H2_CHEM_P1_Ans Prelim

1 © ACJC 2017 9729/01/Prelim/2017 [Turn over ANGLO-CHINESE JUNIOR COLLEGE DEPARTMENT OF CHEMISTRY Preliminary Examination CHEMISTRY 9729/01 Higher 2 Paper 1 Multiple Choice 24 August 2017 1 hour Additional Materials: Optical Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluids. Write your name, index number and tutorial class on the Optical 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 and D. Choose the one you consider correct and record your choice in soft pencil on the separate Optical Answer Sheet. Read the instructions on the Optical 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 14 printed pages, including this cover page. 9729/01/Prelim/17 ANGLO-CHINESE JUNIOR COLLEGE © ACJC 2017 Department of Chemistry [Turn over

2 © ACJC 2017 9729/01/Prelim/2017 [Turn over For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 Carbon disulfide is a colo urless volatile liquid with the formula CS2. The compound is used frequently as a building block in organic chemistry as well as an industrial solvent. It reacts with nitrogen monoxide, NO, to form a yellow solid and two gases. These two gases are formed in equal amounts. What are these two gases? A CO2, NO2 B CO2, N2 C CO, N2 D CO2, N2O The yellow solid is sulfur. You cannot balance the equation (with the two product gases in equal amounts) with the three other options. Balanced equation: CS2 + 2NO  CO2 + N2 + 2S 2 Use of the Data Booklet is relevant to this question. Which of the following ions will be deflected the most in an electric field? A S2- B Br - C F - D O2- You are to refer to the Data Booklet for the ionic radii (although it is not absolutely necessarily to do so; you can use the Group trend for ionic sizes). The charge density of the oxide ion is the highest amongst the four. 3 Use of the Data Booklet is relevant to this question. Nuclear magnetic resonance (NMR) spectroscopy is a n analytical t echnique that uses the magnetic properties of certain atomic nuclei in order to elucidate the structu