2025 Prelim P4 QP_(for exchange)_H2 Chem_HCI

This document consists of 17 printed pages and 1 blank page. HWA CHONG INSTITUTION C2 Preliminary Examination Higher 2 CANDIDATE NAME CT GROUP 2 4 S CENTRE NUMBER S INDEX NUMBER CHEMISTRY Paper 4 Practical 9729/04 26 August 2025 2 hours 30 minutes Candidates answer on the Question Paper. READ THESE INSTRUCTIONS FIRST Write your name, CT group, centre number and index 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. DO NOT WRITE ON ANY BARCODES. 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 17 and 18. 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. Shift Laboratory For Examiner’s Use 1 2 3 Total

2 © Hwa Chong Institution 2025 9729/04/C2 Preliminary Examination DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN Answer all questions in the spaces provided. 1 (a) Qualitative Analysis FA 1 is an aqueous solution of a sodium salt containing two anions. (i) You will devise and perform a series of simple tests to identify the anions present in FA 1. Your tests should be based on the Qualitative Analysis Notes on pages 17 – 18 and should use only the bench reagents provided. Record your tests and observations in the space below. FA 1 does not contain SO32−, NO3− and NO2−. [4] (ii) Use your observations in (a)(i) to deduce the identity of the two anions in FA 1. anions: ………………………… and ……………………………… [2]

3 © Hwa Chong Institution 2025 9729/04/C2 Preliminary Examination DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN [Turn Over BLANK PAGE Question 1 continues on the next page.

4 © Hwa Chong Institution 2025 9729/04/C2 Preliminary Examination DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN (b) FA 2 is ZO2, an oxide of an unknown metal, Z. FA 3 is dilute sul