2024 Prelims HCI H2 Chem P1 (QP)

This document consists of 13 printed pages. HWA CHONG INSTITUTION C2 Preliminary Examination Higher 2 CANDIDATE NAME CT GROUP 2 3 S CENTRE NUMBER S INDEX NUMBER CHEMISTRY Paper 1 Multiple Choice 9729/01 16 September 2024 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. Complete the information on the Answer Sheet as shown below. 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.

2 © Hwa Chong Institution 2024 9729/01/C2 Preliminary Examination [Turn Over 1 Heavy water is a form of water whose hydrogen atoms are all replaced by deuterium ( 2H), and is used in nuclear reactors. What are the numbers of electrons and neutrons in D3O+? electrons neutrons A 10 11 B 11 11 C 10 8 D 11 8 2 Which species has two unpaired electrons? A Li+ B Ti+ C Mg D S 3 The Valence Shell Electron Pair Repulsion theory (VSEPR) is used to predict the bond angles of molecules. Which bond angle is correctly predicted by VSEPR? number of bonded electron pairs around central atom number of lone pairs around central atom bond angle A 2 1 105° B 2 2 118° C 3 1 107° D 3 2 90° 4 Use of the Data Booklet is relevant to this question. Some information about the carbonate ion, CO32–, is given. • all carbon-oxygen bonds are of the same length •  electrons are delocalised throughout the structure What is the likely carbon-oxygen bond energy, in kJ mol–1, in the carbonate ion? A 360 B 485 C 740 D 805

3 © Hwa Chong Institution 2024 9729/01/C2 Preliminary Examination [Turn Over 5 Which bonding type corresponds to its description of physical properties? bonding type physical properties 1 giant covalent high melting point, conducts electricity when in solution but not when solid 2 simple covalent low melting point, does not conduct electricity in any state 3 metallic variety of melting points, conducts electricity when solid and when molten 4 ionic low melting point, conducts electricity in any state A 1 and 2 only B 3 and 4 only C 2 and 3 only D 1 and 4 only 6 The volumes and pressures of equal masses of four gases, nitrogen, methane, chlorine and helium, are separately investigated, at constant temperature. The results are plotted on a graph of pV against V. All