EJC Prelim H2 Chemistry Paper 4 QP

© EJC 9729/04/J2Prelim/25 [Turn Over EUNOIA JUNIOR COLLEGE JC2 Preliminary Examination 2025 General Certificate of Education Advanced Level Higher 2 CANDIDATE NAME CIVICS GROUP 2 4 – INDEX NUMBER CHEMISTRY Paper 4 Practical 9729/04 21 August 2025 2 hour 30 minutes Candidates answer on the Question Paper. Additional Materials: As listed in the Confidental Instructions READ THESE INSTRUCTIONS FIRST Write your name, civics group and registration number on 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 paper clips, highlighters, 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. 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 / 5 2 / 11 3 / 17 4 / 9 5 / 13 Total / 55 This document consists of 20 printed pages.

2 © EJC 9729/04/J2Prelim/25 Answer all the questions in the spaces provided. 1 Investigation of redox reactions involving D-glucose D-Glucose is a sugar with molecular formula C6H12O6, which can react directly or indirectly with potassium manganate(VII), KMnO4. (a) FA 1 is a solution of potassium manganate(VII), KMnO4. FA 2 is a 1.0 mol dm−3 sulfuric acid solution, H2SO4. You are also provided with a solution of D-glucose and bench reagents. Perform the tests described in Table 1.1 and record your observations in the table. Table 1.1 test observations (i) Add 1 cm depth of FA 1 to a test -tube. Add an equal volume of aqueous sodium hydroxide. Add 1 drop of glucose solution and shake thoroughly. Allow to stand for 10 minutes, with occasional shaking. Continue with the remaining parts of Question 1. (ii) Add 1 cm depth of FA 1 to a boiling tube. Add 2 cm depth of FA 2. Add 1 cm depth of glucose solution and warm gently. Shake well to mix. [2]

3 © EJC 9729/04/J2Prelim/25 [Turn Over (b) Manganese species exist in ions of different oxidation states and colours. Suggest the identity of the final manganese-containing species in (a)(i) and in (a)(ii). final manganese-containing species in (a)(i) ................................ ................................ final manganese-containing species in (a)(ii) ................................ ............................... [1] (c) In (a)(i), D-glucose, C6H12O6, reacts with KMnO 4 in alkaline medium to give D-gluconate, C6H11O – 7. (i) Name the type of reaction that D-glucose undergoes