2024 H1 Chem Prelim P1 QP_VJC

© VJC 2024 8873/01/PRELIM/24 [Turn over 1 VICTORIA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 1 CHEMISTRY 8873/01 Paper 1 Multiple Choice 19 September 2024 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 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. A Data Booklet is provided. 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 10 printed pages and 2 blank pages.

© VJC 2024 8873/01/PRELIM/24 2 For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 Use of Data Booklet is relevant to this question. Which particle has a half-filled set of p orbitals? A C– B N2– C F+ D Ne 2 The table shows the sixth ionisation energies of four consecutive elements in the Periodic Table. element W X Y Z sixth ionisation energy / kJ mol–1 19800 21300 8500 9360 What is the formula of the fluoride of W? A WF3 B WF4 C WF5 D WF6 3 Boron trifluoride, BF3, is very difficult to handle due to its high reactivity at room temperature. 1 mole of BF3 can react with 1 mole of dimethyl ether, CH3OCH3 to form compound Q. Which statements are correct? 1 Lone pair electrons on oxygen in CH3OCH3 is donated to the vacant orbital of boron in BF3. 2 The bond angle about boron changes from 120 ° in BF3 to 107° in compound Q. 3 The molecular shape about oxygen changes from bent in CH3OCH3 to trigonal pyramidal in compound Q. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only 4 In which of the following pairs does the second molecule have a greater net dipole moment than that of the first molecule? A NH3, CCl4 B CO, HF C H2O, H2S D CO2, BF3

© VJC 2024 8873/01/PRELIM/24 [Turn over 3 5 Consider the following three compounds. 1 (CH3)2CHOH 2 CH3CH2CHO 3 CH3CH2CH2OH What is the order of decreasing boiling points of the compounds? A 1, 3, 2 B 2, 1, 3 C 3, 2, 1 D 3, 1, 2 6 In which reactions is