2025 RI H2Chem Prelims P4 Questions

1 © Raffles Institution 2025 9729/04/A/25 [Turn Over CANDIDATE NAME ( ) CLASS 25S0 RAFFLES INSTITUTION 2025 YEAR 6 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY Paper 4 Practical 9729/04 27 August 2025 2 hours 30 minutes Do NOT turn over the Question Booklet until you are told to do so. READ THESE INSTRUCTIONS FIRST. Write your name and class on the space provided when instructed to do so. Give details of the practical shift and laboratory where appropriate, in the space provided. Write in dark blue or black pen. You may use a 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 number of marks is given in brackets [ ] at the end of each question or part question. 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 23 and 24. Shift Laboratory Bench Number For Examiner’s Use Question Marks 1 / 14 2 / 19 3 / 13 4 / 9 Total / 55 This document consists of 21 printed pages and 3 blank pages.

2 © Raffles Institution 2025 9729/04/A/25 [Turn Over Answer all the questions in the spaces provided. 1 Investigation of inorganic and organic compounds (a) FA 1 is an aqueous solution containing two cations. FA 2 is an aqueous solution containing one anion. You will perform tests to identify • the two cations present in FA 1 • the anion present in FA 2. (i) Carry out the following tests. Carefully record your observations in Table 1.1. The volumes given below are approximate and should be estimated rather than measured. Test and identify any gases evolved. If there is no observable change, write no observable change. Table 1.1 tests observations 1 Test FA 1 with Universal Indicator paper. 2 Add 1 cm depth of FA 1 into a test-tube. Add aqueous sodium hydroxide, slowly with shaking, until no further change is seen. Filter the mixture into a clean test-tube. To the filtrate, add dilute nitric acid drop-wise until in excess. 3 Add 1 cm depth of FA 2 into a test-tube. Add 1 cm depth of dilute nitric acid. [5]

3 © Raffles Institution 2025 9729/04/A/25 [Turn Over