2021_VJC_Prelim_P1_Qns

1  VJC 2021 8873/01/PRELIM [Turn over VICTORIA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 1 CHEMISTRY 8873/01 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.

2  VJC 2021 8873/01/PRELIM [Turn over This document consists of 11 printed pages and 1 blank page. For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 What is the electronic configuration of Cu+ ion, with proton number 29? A 1s22s22p63s23p63d10 C 1s22s22p63s23p63d84s2 B 1s22s22p63s23p63d94s1 D 1s22s22p63s23p63d84p2 2 Use of the Data Booklet is relevant to this question. The ion X+ has 54 electrons and 78 neutrons. Which of the following statements are incorrect? 1 The fluoride of X formed is expected to have a higher melting point than NaF. 2 The first ionisation energy of element X is lower than that of Fr. 3 In an electric field, the ion X+ will be deflected at a larger angle than that of Na+. A 1, 2 and 3 C 2 and 3 only B 1 and 2 only D 3 only 3 To produce decaffeinated coffee, pure liquid CO2 is sometimes used to extract caffeine from coffee beans. caffeine The solubility of caffeine greatly increased when a mixture of ethanol and liquid CO 2 (ethanol−CO2 mixture) was used. Which interaction best explains why caffeine is more soluble in the ethanol−CO2 mixture as compared to liquid CO2? A instantaneous dipole–induced dipole interactions B permanent dipole–permanent dipole interactions C dative covalent bonding D hydrogen bonding

3  VJC 2021 8873/01/PRELIM [Turn over 4 In which pair does compound X have a higher boiling point than compound Y? compound X compound Y A CH3CO2NH4 CH3CH2NH2 B PH3 PCl3 C CH3COCH3 CH2=CHCH2OH D SiCl4 SiO2 5 The Brønsted–Lowry theory describes acid and base character.