2022 CJC H2 CHEM Prelim P1 QP_FINAL COPY

1 9729/01 CJC JC2 Preliminary Examination 2022 CANDIDATE NAME CLASS 2T CHEMISTRY 9729/01 Paper 1 Multiple Choice 15 September 2022 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, class and NRIC/FIN number 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 14 printed pages. Catholic Junior College JC 2 Preliminary Examinations Higher 2

2 9729/01 CJC JC2 Preliminary Examination 2022 + – R S T 1 Which statement about 27 g of Al is always correct? A It contains the same number of atoms as 1 12 g of 12C. B It contains the same number of atoms as 24 dm 3 of krypton gas at room temperature and pressure. C It contains the same number of hydrogen ions as 1 dm3 of 1 mol dm -3 aqueous sulfuric acid. D It contains the same number of atoms as 28 g of nitrogen gas. 2 The following are flight paths of charged particles as they pass through an electric field at the same speed. Which of the following correctly identifies X, Y and Z? 3 Use of the Data Booklet is relevant to this question. Species containing one or more unpaired electrons can be attracted by an external magnetic field and are said to be paramagnetic. Which of the following species is paramagnetic? 1 Cr3+ 2 Cu+ 3 Ni2+ A 3 B 1 and 2 C 1 and 3 D 1, 2 and 3 X Y Z A 14N‾ 16O2+ 28Si2+ B 14N‾ 14C+ 28Si4+ C 15O+ 14C+ 14N+ D 15O‾ 14C+ 28Si+ X Y Z

3 9729/01 CJC JC2 Preliminary Examination 2022 [Turn over 4 In which of the following sequences are the species quoted in order of decreasing boiling points? A RbCl, KCl B HF, HCl C K, Ca D CO, CO2 5 People drink beverages containing caffeine to relieve or prevent drowsiness and to improve cognitive performance. Caffeine Which statement about caffeine is true? A Caffeine molecule has a planar structure. B The  bond in C=C is formed by sideways overlap of 2p orbitals. C The nitrogen atom in caffeine, N1 is basic. D There are 16 sigma bonds in a caffeine molecule. 6 Which of the following substances conduct electricity due to delocalised electrons? 1 Graphite 2 Solid magnesium 3 Molten sodium chloride A 1 only B 1 and 2 only C 2 and 3 only D 1, 2 and 3

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