2024 PU2 H1 Chem Paper 1 (QP)_MI

Class Adm No Candidate Name: This document consists of 13 printed pages and 1 blank page. 2024 Preliminary Exams Pre–University 2 H1 CHEMISTRY 8873/1 Paper 1 Multiple Choice 19 September 2024 1 hour Additional Materials: Multiple Choice Answer Sheet Additional Materials: Data Booklet READ THESE INSTRUCTIONS FIRST Do not turn over this question paper until you are told to do so. Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. At the top of this page: Write your name, class and admission number in the spaces provided. On the Answer Sheet: Write your name, class and subject. Write your identification number and shade the corresponding bubbles. Ther 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. Marks 30 H Class Adm No

2 1 Which of the following substances contains 1 mol of the stated particles? particles substance A molecules 14.0 g of nitrogen gas B ions 1.00 mol of sodium chloride C hydrogen ions 1 dm3 of 1.00 mol dm–3 sulfuric acid D molecules 24.0 dm3 of carbon dioxide gas at room temperature and pressure 2 10 cm 3 of hydrocarbon was completely combusted in 50 cm 3 of oxygen. 40 cm3 of gas was present after cooling the mixture to room temperature. After passing the gases through sodium hydroxide, 20 cm3 of gas was remaining. What is the molecular formula of the hydrocarbon? A C2H4 B C2H6 C C4H8 D C4H10 3 In a reaction, i odine reacts with nitric acid in the mole ratio 1 : 10. The three products of this reaction are nitrogen dioxide, water and an iodine-containing product, X. What is the oxidation number of iodine in the iodine-containing product, X? A +1 B +3 C +5 D +7 4 Deuterium is an isotope of hydrogen. It has a relative mass of 2. What would be the correct number of subatomic particles present in an ion of deuterium that has a charge of 1–? number of protons number of neutrons number of electrons A 1 1 1 B 1 1 2 C 1 2 1 D 1 2 2

3 [Turn over 5 Which ion, when passed through an electric field, would be deflected the least? A 4He2+ B 6Li+ C 10B3+ D 14N3– 6 Which ion has the highest number of unpaired electrons? A Cr3+ B Fe3+ C Ni2+ D Cu2+ 7 Use of the Data Booklet is relevant to this question. Which metal has the lowest melting point? A Li B Na C Mg D Al