2024 TJC Prelims H1 P1 QP

1 8873 / TJC Prelims / 2024 TEMASEK JUNIOR COLLEGE 2024 JC2 PRELIMINARY EXAMINATION Higher 1 CHEMISTRY 8873/01 Paper 1 Multiple Choice 12 September 2024 1 hour Additional Materials: Multiple Choice Answer Sheet (OMS) Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. There are thirty questions In this paper. Answer all questions. For each question there are four possible answers A, B, C, 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. Write your name & Civics Group on the Answer sheet. Shade your index number in the appropriate boxes. 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. Write your name and Civics Group Index number (refer to entry proof)

2 8873 / TJC Prelims / 2024 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 (OMS). 1 Which statement about the electrons in a ground state nitrogen atom is correct? A There are more electrons in s orbitals than there are in p orbitals. B Electrons are present in two different energy levels. C There is a pair of electrons in one of the p orbitals. D The occupied orbital of highest energy is spherical. 2 In an experiment, protons are deflected by an angle of +10°. In another experiment under identical conditions, particle X is deflected by an angle of –2.5°. What could be the composition of particle X? protons neutrons electrons A 4 4 5 B 2 2 3 C 2 2 1 D 1 2 2 3 Which compound is composed of cation and anion that has the same number of electrons as each other? 1 Na2O 2 NaN3 3 NH4F 4 NaCl A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

3 8873 / TJC Prelims / 2024 [Turn over 4 Use of the Data Booklet is relevant to this question. The sixth ionisation energies of four different elements are shown below. The elements are arsenic, selenium, antimony and tellurium (though not necessarily in that order) from Groups 15 and 16. Which of the following shows the sixth ionisation energy of antimony? A 12300 B 10400 C 7880 D 6820 5 Which feature is present in each of the ions CO32– and SO32–? A All bond angles are 120° B One dative covalent bond C Three sigma bonds D Eight lone pairs of electrons 6 Beryllium chloride, BeCl2, fully reacts with ammonia, NH3 to form a compound. Which of the statements is incorrect? A The compound is formed from 1 mole of BeCl2 and 2 moles of NH3. B The Be-N bond formed is chem