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Redox reactions: WJEC A‑Level Chemistry questions

Every WJEC A-Level Chemistry exam question on 3.2 Redox reactions, 2016–2025, with its mark scheme and examiner’s report.

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1,204 questions

  1. Q4

    Summer 2025 · Unit 3

    1 mark3.2 Redox reactions
    The whole paper ↗
    Summer 2025 Unit 3, question 4: Ethanedioic acid, (COOH)2, can be oxidised by acidified manganate(VII) ions. Use the half-equations below to write the ionic equation for the reaction. [1] _ _

  2. Q10(c)(i)

    Summer 2025 · Unit 3

    3 marks3.2 Redox reactions
    The whole paper ↗
    Summer 2025 Unit 3, question 10(c)(i): Write the equations for the following reactions: Cu2+(aq) with I–(aq) • 2–(aq) • I2(aq) with S2O3 2–(aq) is equivalent to 1 mol of Cu2+(aq) in the Hence show th

  3. Q8(c)(i)

    Summer 2024 · Unit 3

    1 mark3.2 Redox reactions
    The whole paper ↗
    Summer 2024 Unit 3, question 8(c)(i): Write the half-equation for the oxidation of iodide ions. [1]

  4. Q8(c)(ii)

    Summer 2024 · Unit 3

    1 mark3.2 Redox reactions
    The whole paper ↗
    Summer 2024 Unit 3, question 8(c)(ii): Write the half-equation for the reduction of VO2 [1]

  5. Q10(b)(iii)

    Summer 2024 · Unit 3

    3 marks3.2 Redox reactions
    The whole paper ↗
    Summer 2024 Unit 3, question 10(b)(iii): acidified potassium manganate(VII) of concentration 2.10 × 10–3 mol dm–3. – 5Fe2+ 8H+ Mn2+ 5Fe3+ MnO4 + + + + 4H2O The mean volume of acidified potassium mangan

  6. Q8(b)(i)

    Summer 2023 · Unit 3

    1 mark3.2 Redox reactions
    The whole paper ↗
    Summer 2023 Unit 3, question 8(b)(i): Write the half-equation for acidified dichromate ions acting as an oxidising agent. [1]

  7. Q8(b)(ii)

    Summer 2023 · Unit 3

    1 mark3.2 Redox reactions
    The whole paper ↗
    Summer 2023 Unit 3, question 8(b)(ii): Write an equation for the oxidation of iodide ions to iodine molecules using acidified dichromate. [1]

  8. Q8(b)(iii)

    Summer 2023 · Unit 3

    4 marks3.2 Redox reactions
    The whole paper ↗
    Summer 2023 Unit 3, question 8(b)(iii): part (a) with a small amount of dilute acid. This produced iodine. Aqueous sodium thiosulfate was added from a burette and 24.30 cm3 of Na2S2O3(aq) was needed f

  9. Q9(e)(ii)

    Summer 2022 · Unit 3

    2 marks3.2 Redox reactions
    The whole paper ↗
    Summer 2022 Unit 3, question 9(e)(ii): Aqueous iron(II) compounds form a precipitate of a different colour with aqueous sodium hydroxide. In a test tube, the precipitate can change colour on standing

  10. Q10(b)(ii)

    Summer 2019 · Unit 3

    1 mark3.2 Redox reactions
    The whole paper ↗
    Summer 2019 Unit 3, question 10(b)(ii): One method of measuring the concentration of thiosulfate ions in solution is by titration using a solution containing iodine. Suggest an indicator for this titr

  11. Q11(a)(i)

    Summer 2019 · Unit 3

    2 marks3.2 Redox reactions
    The whole paper ↗
    Summer 2019 Unit 3, question 11(a)(i): The half-equation for the oxidation of oxalic acid is shown below. (COOH)2 2CO2 + 2H+ + 2e– State the half-equation for the reduction of manganate(VII) ions in

  12. Q11(a)(ii)

    Summer 2019 · Unit 3

    4 marks3.2 Redox reactions
    The whole paper ↗
    Summer 2019 Unit 3, question 11(a)(ii): potassium manganate(VII) solution of concentration 0.0505 mol dm–3 gave the following results. 1 2 3 4 Volume of KMnO4 solution / cm3 31.65 31.30 31.60 31.75 I.

  13. Q13(a)

    Summer 2019 · Unit 3

    4 marks3.2 Redox reactions
    The whole paper ↗
    Summer 2019 Unit 3, question 13(a): Potassium dichromate(VI) is used as a reagent in acid solution in a wide range of redox reactions. The dichromate(VI) ions can be reduced using excess metallic
All 13 questions on Redox reactions, as a list
  1. Summer 2025, Unit 3, Q4 (1 mark): Ethanedioic acid, (COOH)2, can be oxidised by acidified manganate(VII) ions. Use the half-equations below to write the ionic equation for the reaction. [1] _ _
  2. Summer 2025, Unit 3, Q10(c)(i) (3 marks): Write the equations for the following reactions: Cu2+(aq) with I–(aq) • 2–(aq) • I2(aq) with S2O3 2–(aq) is equivalent to 1 mol of Cu2+(aq) in the Hence show th
  3. Summer 2024, Unit 3, Q8(c)(i) (1 mark): Write the half-equation for the oxidation of iodide ions. [1]
  4. Summer 2024, Unit 3, Q8(c)(ii) (1 mark): Write the half-equation for the reduction of VO2 [1]
  5. Summer 2024, Unit 3, Q10(b)(iii) (3 marks): acidified potassium manganate(VII) of concentration 2.10 × 10–3 mol dm–3. – 5Fe2+ 8H+ Mn2+ 5Fe3+ MnO4 + + + + 4H2O The mean volume of acidified potassium mangan
  6. Summer 2023, Unit 3, Q8(b)(i) (1 mark): Write the half-equation for acidified dichromate ions acting as an oxidising agent. [1]
  7. Summer 2023, Unit 3, Q8(b)(ii) (1 mark): Write an equation for the oxidation of iodide ions to iodine molecules using acidified dichromate. [1]
  8. Summer 2023, Unit 3, Q8(b)(iii) (4 marks): part (a) with a small amount of dilute acid. This produced iodine. Aqueous sodium thiosulfate was added from a burette and 24.30 cm3 of Na2S2O3(aq) was needed f
  9. Summer 2022, Unit 3, Q9(e)(ii) (2 marks): Aqueous iron(II) compounds form a precipitate of a different colour with aqueous sodium hydroxide. In a test tube, the precipitate can change colour on standing
  10. Summer 2019, Unit 3, Q10(b)(ii) (1 mark): One method of measuring the concentration of thiosulfate ions in solution is by titration using a solution containing iodine. Suggest an indicator for this titr
  11. Summer 2019, Unit 3, Q11(a)(i) (2 marks): The half-equation for the oxidation of oxalic acid is shown below. (COOH)2 2CO2 + 2H+ + 2e– State the half-equation for the reduction of manganate(VII) ions in
  12. Summer 2019, Unit 3, Q11(a)(ii) (4 marks): potassium manganate(VII) solution of concentration 0.0505 mol dm–3 gave the following results. 1 2 3 4 Volume of KMnO4 solution / cm3 31.65 31.30 31.60 31.75 I.
  13. Summer 2019, Unit 3, Q13(a) (4 marks): Potassium dichromate(VI) is used as a reagent in acid solution in a wide range of redox reactions. The dichromate(VI) ions can be reduced using excess metallic

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