VJC 2021 Prelim H2P1 Qns [Final]

1 Ó VJC 2021 9729/01/PRELIM [Turn over VICTORIA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9729//01 Paper 1 Multiple Choice 23 September 2021 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 index number, name and CT group on the Answer Sheet. There are thirty questions. 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 15 printed pages and 1 blank page.

2 Ó VJC 2021 9729/01/PRELIM [Turn over For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 Use of the Data Booklet is relevant to this question. The ion X2+ has 53 electrons and 78 neutrons. Which of the following statements are incorrect? 1 X atom is isoelectronic with Xe. 2 The fluoride of X is expected to have a higher melting point than RbF. 3 The first ionisation energy of element X is lower than that of Fr. 4 In an electric field, the ion X2+ will be deflected at a smaller angle than that of Na+. A 1, 2 and 3 C 2 and 4 only B 1 and 4 only D 3 only 2 To produce decaffeinated coffee, the ethanol-CO2 mixture is used to extract caffeine from coffee beans. caffeine Which statement about caffeine is incorrect? A Caffeine is more soluble in the ethanol-CO2 mixture due to the hydrogen bond formed between ethanol and caffeine. B Caffeine molecule has a planar structure. C There are altogether 25 sigma bonds and 4 pi bonds in a caffeine molecule. D There are 5 carbon atoms which are sp2 hybridised.

3 Ó VJC 2021 9729/01/PRELIM [Turn over 3 In which pair does compound X have a higher boiling point than compound Y? compound X compound Y A CH3CO2NH4 CH3CH2NH2 B SiCl4 SiO2 C PH3 SiCl3H D Ni(OH)2 NiSO4 4 A vessel is made of an air-filled plastic and has a volume of 40.0 cm3. At 27 oC and 52.8 kPa, a slightly dented vessel of volume 38.5 cm3 is filled with air. To restore its original shape, the air inside the dented vessel is heated to a temperature of 60 oC. The pressure of air inside the vessel increases an