MI Prelim H2 Chem P4 QP_for exchange

Class Adm No Candidate Name: This question paper consists of 16 printed pages and 2 blank pages. 2025 Preliminary Examination Pre-University 3 H2 CHEMISTRY 9729/04 Paper 4 Practical 28 Aug 2025 2 hours 30 minutes Candidates answer on the Question paper. READ THESE INSTRUCTIONS FIRST Do not turn over this question paper until you are told to do so. Write your name, class and admission number on all the work you hand in. Give details of the practical shift and laboratory where appropriate, in the boxes provided. 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. The use of an approved scientific calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. Qualitative Analysis Notes are printed on pages 16 and 17. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. Question 1 2 3 4 Total Marks 8 28 11 8 55 H Shift Laboratory

2 1 Identification of anions FA 1 is an aqueous solution containing two anions. You will perform tests to identify the two anions in FA 1. You are not expected to identify the cations. Unless otherwise stated, the volumes given below are approximate and should be estimated rather than measured. Test and identify any gases evolved. (a) Carry out the following tests. Carefully record your observations in Table 1.1. Table 1.1 tests observations 1 Test FA 1 solution using Universal Indicator paper. 2 To a 1 cm depth of FA 1 in a clean test- tube, add 1 cm depth of aqueous silver nitrate. Add excess aqueous ammonia. 3 To a 1 cm depth of FA 1 in a clean boiling tube, add a small piece of aluminium foil into the boiling tube, then heat gently over a Bunsen flame. 4 To a 1 cm depth of FA 1 in a clean test- tube, add 2 cm depth of dilute hydrochloric acid. No effervescence observed [4]

3 [Turn over (b) Identify the two anions in FA 1 and state the evidence for each anion by completing Table 1.2. The evidence given must be sufficiently conclusive in identifying the anions. Table 1.2 anion evidence [4] [Total: 8]

4 2 Investigation on a solution of oxalic acid Oxalic acid is a common organic acid containing the carboxylic acid functional group. You will perform two separate experiments to investigate its properties. (a) Determination of concentration and enthalpy change of neutralisation by thermometric titration Oxalic acid is an organic acid that occurs na