2024 ACJC Prelim H1 Chem Paper 1 QP

This document consists of 12 printed pages. Anglo-Chinese Junior College JC2 Preliminary Examination Higher 1 CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Data Booklet 8873/01 9 September 2024 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, Centre number and index 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 booklet. The use of an approved scientific calculator is expected, where appropriate.

2 © ACJC 2024 8873/Preliminary Examination/2024 [Turn over 1 Carbon sulfide, CS2, is a volatile flammable liquid used in the manufacture of cellophane. On combustion, CS2 is oxidised as follows. CS2(g) + 3O2(g) CO2(g) + 2SO2(g) A 20 cm3 sample of carbon disulfide vapour is ignited with 100 cm 3 of oxygen. The final volume of gas after burning is treated with an excess of aqueous alkali. What percentage of this final volume dissolves in the alkali? [All volumes are measured at the same temperature and pressure.] A 20% B 40% C 60% D 80% 2 2 mol of n itric acid, HNO 3, a powerful oxidising agent , reacts with 3 mol of hydrogen sulfide, H2S, to form three products, one of which is water. In this reaction, the oxidation number of nitrogen decreases by 3. What are the other two products of this reaction? A N2O2 and H2SO4 C NO and SO2 B NO and S D N2O2 and H2SO3 3 Consider the following half-equations. MnO4– + 8H+ + 5e– Mn2+ + 4H2O Fe2+ Fe3+ + e– C2O42– 2CO2 + 2e– What volume of 0.01 mol dm–3 KMnO4 is required to oxidise 15 cm3 of an acidified solution of 0.01 mol dm–3 FeC2O4? A 3 cm3 B 6 cm3 C 9 cm3 D 15 cm3

3 © ACJC 2024 8873/Preliminary Examination/2024 [Turn over 4 Use of the Data Booklet is relevant to this question. The table shows statements made by three students about the s, p and d electrons in the atoms of the element with atomic number 30. student statement X There are s electrons in 4 different quantum shells. Y There are p electrons in 2 different quantum shells. Z The d electrons have