Skip to content
Try on iPad

Redox processes: electron transfer and changes in oxidation number (oxidation state): CAIE A‑Level Chemistry questions

Every CAIE A-Level Chemistry exam question on 6.1 Redox processes: electron transfer and changes in oxidation number (oxidation state), June 2024 and the specimen papers, with its mark scheme and examiner’s report.

Find questions312
Calculations

312 questions

  1. Q1(h)

    June 2024 · Paper 5

    1 mark6.1 Redox processes: electron transfer and changes in oxidation number (oxidation state)
    The whole paper ↗
    June 2024 Paper 5, question 1(h): Suggest why this method is unsuitable for samples of tap water that have been purified by chlorination and so contain Cl2(aq). [1] [Total: 16]

  2. Q11

    June 2024 · Paper 1

    1 mark6.1 Redox processes: electron transfer and changes in oxidation number (oxidation state)
    The whole paper ↗
    June 2024 Paper 1, question 11: Sodium chromate(VI), Na2CrO4, is manufactured by heating chromite, FeCr2O4, with sodium carbonate in an oxidising atmosphere. Chromite contains Cr2O4 2– ions. 1

  3. Q12

    June 2024 · Paper 1

    1 mark6.1 Redox processes: electron transfer and changes in oxidation number (oxidation state)
    The whole paper ↗
    June 2024 Paper 1, question 12: Oxygen can be prepared by the reaction of potassium manganate(VII), KMnO4, hydrogen peroxide, H2O2, and sulfuric acid, H2SO4. Each H2O2 molecule loses two elect

  4. Q2(c)(i)

    June 2024 · Paper 2

    1 mark6.1 Redox processes: electron transfer and changes in oxidation number (oxidation state)
    The whole paper ↗
    June 2024 Paper 2, question 2(c)(i): Deduce the oxidation numbers of magnesium and nitrogen in magnesium nitride to complete Table 2.1. Table 2.1 oxidation number in Mg3N2 magnesium nitrogen [1]

  5. Q10

    Specimen · Paper 1

    1 mark6.1 Redox processes: electron transfer and changes in oxidation number (oxidation state)
    The whole paper ↗
    Specimen Paper 1, question 10: Solutions containing chlorate(I) ions are used as household bleaches and disinfectants. These solutions decompose on heating as shown. 3Cl O– → Cl O3 – + 2Cl –

  6. Q11

    Specimen · Paper 1

    1 mark6.1 Redox processes: electron transfer and changes in oxidation number (oxidation state)
    The whole paper ↗
    Specimen Paper 1, question 11: When K2MnO4 is dissolved in water, the following reaction occurs. aMnO4 2–(aq) + bH2O(l) → cMnO4 –(aq) + d MnO2(s) + eOH–(aq) What could be the values of a and

  7. Q3(c)(ii)

    Specimen · Paper 2

    1 mark6.1 Redox processes: electron transfer and changes in oxidation number (oxidation state)
    The whole paper ↗
    Specimen Paper 2, question 3(c)(ii): The chlorate(I) ion is unstable and decomposes when heated as shown. 3Cl O– → 2Cl – + Cl O3 – This reaction can be described as a disproportionation reaction. D

  8. Q3(c)(iii)

    Specimen · Paper 2

    1 mark6.1 Redox processes: electron transfer and changes in oxidation number (oxidation state)
    The whole paper ↗
    Specimen Paper 2, question 3(c)(iii): Deduce the oxidation number of chlorine in each species for the equation in (c)(ii). Complete the boxes. 3Cl O– → 2Cl – + Cl O3 – oxidation number of chlorine +
All 8 questions on Redox processes: electron transfer and changes in oxidation number (oxidation state), as a list
  1. June 2024, Paper 5, Q1(h) (1 mark): Suggest why this method is unsuitable for samples of tap water that have been purified by chlorination and so contain Cl2(aq). [1] [Total: 16]
  2. June 2024, Paper 1, Q11 (1 mark): Sodium chromate(VI), Na2CrO4, is manufactured by heating chromite, FeCr2O4, with sodium carbonate in an oxidising atmosphere. Chromite contains Cr2O4 2– ions. 1
  3. June 2024, Paper 1, Q12 (1 mark): Oxygen can be prepared by the reaction of potassium manganate(VII), KMnO4, hydrogen peroxide, H2O2, and sulfuric acid, H2SO4. Each H2O2 molecule loses two elect
  4. June 2024, Paper 2, Q2(c)(i) (1 mark): Deduce the oxidation numbers of magnesium and nitrogen in magnesium nitride to complete Table 2.1. Table 2.1 oxidation number in Mg3N2 magnesium nitrogen [1]
  5. Specimen, Paper 1, Q10 (1 mark): Solutions containing chlorate(I) ions are used as household bleaches and disinfectants. These solutions decompose on heating as shown. 3Cl O– → Cl O3 – + 2Cl –
  6. Specimen, Paper 1, Q11 (1 mark): When K2MnO4 is dissolved in water, the following reaction occurs. aMnO4 2–(aq) + bH2O(l) → cMnO4 –(aq) + d MnO2(s) + eOH–(aq) What could be the values of a and
  7. Specimen, Paper 2, Q3(c)(ii) (1 mark): The chlorate(I) ion is unstable and decomposes when heated as shown. 3Cl O– → 2Cl – + Cl O3 – This reaction can be described as a disproportionation reaction. D
  8. Specimen, Paper 2, Q3(c)(iii) (1 mark): Deduce the oxidation number of chlorine in each species for the equation in (c)(ii). Complete the boxes. 3Cl O– → 2Cl – + Cl O3 – oxidation number of chlorine +

Questions, mark schemes and examiner’s reports are © Cambridge University Press & Assessment, from their published past papers. Plumi isn’t affiliated with any exam board. Want whole papers? Every CAIE A-Level Chemistry paper.

Rather write your answers by hand on iPad? Plumi marks them against the same mark schemes.