2024 Prelims VJC H2 Chem P3 (QP)

© VJC 2024 9729/03/PRELIM/24 [Turn over CANDIDATE NAME CT GROUP VICTORIA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 ……………………………………………….………….. …………………………….. CHEMISTRY 9729/03 Paper 3 Free Response Candidates answer on the Question Paper. Additional Materials: Data Booklet 16 September 2024 2 hours READ THESE INSTRUCTIONS FIRST Write your name and CT group on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions in the spaces provided on the Question Paper. If additional space is required, you should use the pages at the end of this booklet. The question number must be clearly shown. Section A Answer all questions. Section B Answer one question. A Data Booklet is provided. The use of an approved scientific calculator is expected, where appropriate. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 27 printed pages and 1 blank page. For Examiner’s Use Section A 1 / 23 2 / 19 3 / 18 Section B 4 / 20 OR 5 / 20 Total / 80

2 © VJC 2024 9729/03/PRELIM/24 Section A Answer all the questions in this section. 1 (a) Chlorine is bubbled through 100 cm3 of hot 4.0 mol dm–3 sodium hydroxide until the reaction is complete. 6NaOH(aq) + xCl2(aq) → yNaCl(aq) + zNaClO3(aq) + 3H2O(l) (i) State the type of reaction that occurs. Explain your answer in terms of changes in oxidation numbers. [1] (ii) Determine the values of x, y and z. [1] (iii) Determine the concentration of Na+(aq), in mol dm–3, after the reaction. [1] …….…………..……………………………………………………………………………… …….…………..……………………………………………………………………………… …….…………..……………………………………………………………………………… …….…………..……………………………………………………………………………… …….…………..……………………………………………………………………………… …….…………..……………………………………………………………………………… …….…………..……………………………………………………………………………… …….…………..……………………………………………………………………………… …….…………..……………………………………………………………………………… …….…………..……………………………………………………………………………… …….…………..……………………………………………………………………………… …….…………..……………………………………………………………………………… …….…………..……………………………………………………………………………… …….…………..……………………………………………………………………………… …….…………..……………………………………………………………………………… …….…………..……………………………………………………………………………… …….…………..……………………………………………………………………………… …….…………..……………………………………………………………………………… …….…………..……………………………………………………………………………… …….…………..………………………………………………………………………………

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