2020 YIJC Prelim Exam Paper 1 QP

©YIJC [Turn over YISHUN INNOVA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CANDIDATE NAME CG INDEX NO CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Data Booklet 9729/01 17 September 2020 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name and class on the Answer Sheet in the spaces provided unless this has been done for you. 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 12 printed pages.

2 ©YIJC [Turn over 1 Which statement about the electrons in a ground state carbon atom is correct? A The occupied orbital of highest energy is spherical. B The occupied orbital of lowest energy is spherical. C There are more electrons in p orbitals than there are in s orbitals. D Electrons are present in four different energy levels. 2 Use of the Data Booklet is relevant to this question. In an experiment, an ore sample containing phosphorus and an unknown element X is vapourised, ionised and passed through an electric field at the same speed. What could be the identity of element X? A sulfur B silicon C sodium D nitrogen 3 Which molecule or ion contains the smallest bond angle? A C2H4 B HCHO C NH4+ D NH3 4 Which compounds contain an odd number of  bonds? 1 C2H2 2 C2H5OH 3 CH3CHO 4 CH3CO2H A 1, 2, 3 and 4 B 1 and 2 only C 1 and 4 only D 2 and 3 only beam of P+ and X+ +  P+ X+

3 ©YIJC [Turn over 5 Three identical flasks each contains the same mass of gases X, Y and Z respectively. The temperature, t, and pressure, p, of each flask are indicated below. gas temperature pressure X t p Y t 2p Z 2t p Assuming ideal gas be haviour, what is the order of the relative molecular masses , Mr, of the three gases? A Mr(Z) > Mr(X) > Mr(Y) B Mr(Z) > Mr(Y) > Mr(X) C Mr(X) > Mr(Y) > Mr(Z) D Mr(X) > Mr(Z) > Mr(Y) 6 Use of the Data Booklet is relevant to this question. How many atoms are there in 500 cm3 of carbon dioxide at r.t.p.? A 1.25 1022 B 1.34 1022 C 3.76 1022 D 9.0 1026 7 In oil refineries, an important process is the recovery of any sulfur f