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Sustainability: OCR A‑Level Chemistry B questions

Every OCR A-Level Chemistry B exam question on OZ Sustainability (specification points OZ(r)), 2016–2025, with its mark scheme and examiner’s report.

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2,049 questions

  1. Q1(a)(vi)

    June 2025 · Paper 2

    2 marksOZ Sustainability
    The whole paper ↗
    June 2025 Paper 2, question 1(a)(vi): Why is the breakdown of ozone in the stratosphere harmful to humans? [2]

  2. Q22(b)

    June 2025 · AS Paper 1

    4 marksOZ Reaction mechanismsOZ Sustainability
    The whole paper ↗
    June 2025 AS Paper 1, question 22(b): C2H5Cl was once used as an aerosol propellant in spray cans. It is no longer used because it causes the breakdown of ozone in the stratosphere. Describe how C2H

  3. Q2(d)(iv)

    June 2024 · AS Paper 2

    1 markOZ Sustainability
    The whole paper ↗
    June 2024 AS Paper 2, question 2(d)(iv): Ozone is also present in the troposphere where it is a pollutant. Give one problem caused by ozone in the troposphere. [1]

  4. Q1(a)

    June 2023 · Paper 3

    1 markOZ Sustainability
    The whole paper ↗
    June 2023 Paper 3, question 1(a): Give one polluting effect of ozone in the troposphere. [1]

  5. Q22(a)(i)

    June 2022 · AS Paper 1

    2 marksOZ Sustainability
    The whole paper ↗
    June 2022 AS Paper 1, question 22(a)(i): State two polluting effects of ozone in the troposphere. 1. 2. [2]

  6. Q22(b)

    June 2022 · AS Paper 1

    1 markOZ Sustainability
    The whole paper ↗
    June 2022 AS Paper 1, question 22(b): In the stratosphere, ozone acts as a sunscreen, blocking out high-energy UV radiation. Give one way in which high-energy UV is harmful to humans. [1]

  7. Q21(b)(i)

    November 2020 · AS Paper 1

    1 markOZ Sustainability
    The whole paper ↗
    November 2020 AS Paper 1, question 21(b)(i): Ozone absorbs high-energy UV radiation in the stratosphere. State one effect that this radiation has on life on Earth. [1]

  8. Q21(b)(ii)

    November 2020 · AS Paper 1

    1 markOZ Sustainability
    The whole paper ↗
    November 2020 AS Paper 1, question 21(b)(ii): Why is ozone a pollutant in the troposphere? [1]

  9. Q4(d)

    June 2019 · AS Paper 2

    6 marksOZ Sustainability
    The whole paper ↗
    June 2019 AS Paper 2, question 4(d): Halons are halogenated organic compounds. Halons have been particularly useful in aircraft fire extinguishers. One halon is Halon–1211, CBrCl F2. In the high te

  10. Q34(b)(ii)

    June 2018 · Paper 1

    1 markOZ Sustainability
    The whole paper ↗
    June 2018 Paper 1, question 34(b)(ii): Write in the box the overall equation for the reaction sequence in equations 34.1 – 34.5. [1]

  11. Q5

    June 2018 · AS Paper 1

    1 markOZ Sustainability
    The whole paper ↗
    June 2018 AS Paper 1, question 5: Which statement about ozone is correct? A Ozone is a polluting gas in the stratosphere. B Ozone acts as a sunscreen in the stratosphere. C There is no ozone in

  12. Q3(g)(iv)

    June 2018 · AS Paper 2

    1 markOZ Sustainability
    The whole paper ↗
    June 2018 AS Paper 2, question 3(g)(iv): Give one disadvantage of a build-up of tropospheric ozone. [1]

  13. Q1(g)

    June 2017 · AS Paper 2

    6 marksOZ Reaction mechanismsOZ Sustainability
    The whole paper ↗
    June 2017 AS Paper 2, question 1(g): It is known that some solid transition metal oxides can act as heterogeneous catalysts for this reaction. (g)* Both oxygen and chlorine atoms react with ozone i
All 13 questions on Sustainability, as a list
  1. June 2025, Paper 2, Q1(a)(vi) (2 marks): Why is the breakdown of ozone in the stratosphere harmful to humans? [2]
  2. June 2025, AS Paper 1, Q22(b) (4 marks): C2H5Cl was once used as an aerosol propellant in spray cans. It is no longer used because it causes the breakdown of ozone in the stratosphere. Describe how C2H
  3. June 2024, AS Paper 2, Q2(d)(iv) (1 mark): Ozone is also present in the troposphere where it is a pollutant. Give one problem caused by ozone in the troposphere. [1]
  4. June 2023, Paper 3, Q1(a) (1 mark): Give one polluting effect of ozone in the troposphere. [1]
  5. June 2022, AS Paper 1, Q22(a)(i) (2 marks): State two polluting effects of ozone in the troposphere. 1. 2. [2]
  6. June 2022, AS Paper 1, Q22(b) (1 mark): In the stratosphere, ozone acts as a sunscreen, blocking out high-energy UV radiation. Give one way in which high-energy UV is harmful to humans. [1]
  7. November 2020, AS Paper 1, Q21(b)(i) (1 mark): Ozone absorbs high-energy UV radiation in the stratosphere. State one effect that this radiation has on life on Earth. [1]
  8. November 2020, AS Paper 1, Q21(b)(ii) (1 mark): Why is ozone a pollutant in the troposphere? [1]
  9. June 2019, AS Paper 2, Q4(d) (6 marks): Halons are halogenated organic compounds. Halons have been particularly useful in aircraft fire extinguishers. One halon is Halon–1211, CBrCl F2. In the high te
  10. June 2018, Paper 1, Q34(b)(ii) (1 mark): Write in the box the overall equation for the reaction sequence in equations 34.1 – 34.5. [1]
  11. June 2018, AS Paper 1, Q5 (1 mark): Which statement about ozone is correct? A Ozone is a polluting gas in the stratosphere. B Ozone acts as a sunscreen in the stratosphere. C There is no ozone in
  12. June 2018, AS Paper 2, Q3(g)(iv) (1 mark): Give one disadvantage of a build-up of tropospheric ozone. [1]
  13. June 2017, AS Paper 2, Q1(g) (6 marks): It is known that some solid transition metal oxides can act as heterogeneous catalysts for this reaction. (g)* Both oxygen and chlorine atoms react with ozone i

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