2025 ASRJC Prelim H2Chem P4_CI

1 2025 H2 Chemistry Preliminary Exam Paper 4 Preparation Instructions Apparatus 2  burettes and clips 1  10 cm3 pipette 1  25 cm3 pipette 1  pipette filler 1  retort stand and clamp 2  filter funnel 1  white tile 2  250 cm3 conical flasks 1  100 cm3 volumetric flask 1  25 cm3 measuring cylinder 1  test-tube rack 8 test-tubes 1  test-tube holder 1  marker 2  250 cm3 beaker 2  Styrofoam cup 1  thermometer 1  bunsen burner 1  lighter 1  wash bottle containing deionised water 1  pair of safety goggles 1  waste bottle (communal) hot water pot (communal) A clear plastic bag containing: • 8 teat pipettes • 1  wooden splint • 3  paper towels • 2  blue litmus paper • 2  red litmus paper Chemicals FA reagents (1 set for every candidate) *Note to invigilator: No FA 6 is provided. Please ask the student to read the question carefully. Label per candidate identity FA 1 100 cm³ Hydrochloric acid (HCl), 1.80 mol dm–3 FA 2 50 cm³ Sodium hydroxide (NaOH), 1.50 mol dm–3 FA 3 90 - 100 cm3 0.10 mol dm–3 NaCl Dissolve 5.85g of NaCl in each dm3 of solution FA 4 130 cm3 0.05 mol dm–3 iodine in aqueous potassium iodide Dissolve 12.69 of iodine with 40 g of KI in 1 dm3 of solution FA 5 150 cm3 0.100 mol dm–3 sodium thiosulfate Dissolve 24.82g of Na2S2O3.5H2O or 15.82g of Na2S2O3 in each dm3 of solution. FA 7 10 cm3 Propanone FA 8 10 cm3 Glucose (in replacement of propanal) FA 9 10 cm3 Propan-2-ol FA 10 10 cm3 ethanoic acid (in replacement of Propanoic acid)

2 Label per candidate identity Solution S 10 cm3 Starch solution Fehling’s solution 5-10 cm3 Fehling’s solution 2,4-DNPH 5-10 cm3 2,4-DNPH sodium carbonate 5-10 cm3 sodium carbonate Bench reagents NaOH Limewater