VJC 2020 H2 Chem Prelim P1_QP

 VJC 2020 9729/01/PRELIM/20 [Turn over VICTORIA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 24 September 2020 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, CT group and VJC exam number on the Answer Sheet in the spaces provided unless this has been done for you. Do not shade your NRIC number. DO NOT WRITE IN ANY BARCODES. 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 choices in soft pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. No mark will 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 12 printed pages.

2  VJC 2020 9729/01/PRELIM/20 1 Which particle contains the most number of unpaired electrons? A Cr B Cu2+ C Mn2+ D Te2– 2 Which ion has less electrons than neutrons and less neutrons than protons? Ion Neutrons Nucleons W– 18 37 X2+ 17 34 Y3+ 16 33 Z3– 16 31 A W– B X2+ C Y3+ D Z3– 3 What is the number of  and  bonds in the molecule, (CN)2CC(CN)2?   A 5 9 B 9 5 C 9 9 D 13 5 4 Which species have the same shape as XeF2? A Cl2O B NO2 C IBr2– D SO32– 5 The Gas Laws can be summarised in the general gas equation pV=nRT, where each symbol has its usual meaning. Which of the following statements are correct? 1 One mole of any ideal gas occupies the same volume under the same conditions of temperature and pressure. 2 The density of an ideal gas at constant pressure is in versely proportional to the temperature. 3 The volume of a given mass of an ideal gas is doubled if its temperature is raised from 25 oC to 50 oC at constant pressure. A 1, 2 and 3 B 1 and 2 only C 1 only D 2 and 3 only

3  VJC 2020 9729/01/PRELIM/20 [Turn over 6 In an experiment, 0.10 g of a volatile liquid P formed 0.025 dm 3 of vapour at 100oC and at 1 bar. What is the relative molecular mass of P? A 0.10 × 373 0.025 × 22.7 B 0.025 × 273 × 22.7 0.10 × 373 C 0.025 × 373 × 22.7 0.10 × 273 D 0.10 × 373 × 22.7 0.025 × 273 7 The graph below shows the variation in the boiling point for 8 consecutive elements in the Periodic Table, all with atomic number les