2021 EJC Prelims Paper 1_QP

© EJC [Turn Over EUNOIA JUNIOR COLLEGE JC2 Preliminary Examination 2021 General Certificate of Education Advanced Level Higher 2 CHEMISTRY Paper 1 Multiple Choice 9729/01 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 name, civics group and registration number 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 question paper. The use of an approved scientific calculator is expected, where appropriate. This document consists of 10 printed pages.

2 © EJC 9729/01/J2PE/21 1 Which electronic configuration represent s an atom of an element, at ground state, that forms a stable ion with a charge of +3? A 1s2 2s2 2p3 B 1s2 2s2 2p6 3s2 3p1 C 1s2 2s2 2p6 3s2 3p6 D 1s2 2s2 2p6 3s2 3p6 3d2 4s1 2 Which particle has more protons than electrons and more protons than neutrons? ( ) 2 1DH= A H3O+ B D3O+ C D2O D OH– 3 Gaseous particle R has a proton number n and forms a stable monoatomic ion of charge ‒1. Gaseous particle S has a proton number of ( n+2) and it forms a stable monoatomic ion which is isoelectronic with the ion of R. Which of the following statement is correct? A Ion of S has a smaller ionic radius than ion of R. B Ion of R releases more energy than ion of S when an electron is added to each particle. C R has a larger atomic radius than S. D Ion of S requires less energy than ion of R when an electron is removed from each particle. 4 In a single covalent bond, one pair of electrons is shared by two atoms. Which of the following statement is true for all single covalent bonds? A Covalent bonds are formed when bonding electrons are shared equally between two atoms. B Covalent bonds allow the atoms involved to complete their outer electron shell configuration. C Covalent bonds formed between atoms of different electronegativities are stronger. D Covalent C−H bonds formed between sp3 hybridised C and H atoms are weaker than that formed between sp2 hybridised C and H atoms.

3 © EJC 9729/01/J2PE/21 [Turn over 5 Cinnamaldehyde occurs naturally in cinnamon oil. Which of the following statements are true about the structure? 1 Hydrogen bonds can be formed between cinnamaldehyde molecules. 2 Cinnamaldehyde dissolves in organic solvents readily via instantaneous dipole−induced dipole interactions. 3 The bond angl