plumiCFCs and the ozone layer: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 4.2.2.3 CFCs and the ozone layer, 2016–2025, with mark schemes and examiner’s reports where available.
Paper
All papers
Exam
All years
Calculations
Loading the question…
Open the full PDFYour answerLoading the question…
Open the full PDFYour answerQ17(a)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFLoading the question…
Open the full PDFYour answerQ4(c)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDF
All 5 questions on CFCs and the ozone layer, as a list
- June 2025, AS Paper 1, Q16 (1 mark): Which equation is a propagation step in the catalytic breakdown of ozone? A C2F2Cl 2 C2F2Cl • + Cl • B O3 + O 2O2 C Cl • + Cl • Cl 2 D Cl O• + O Cl • + O2 Your
- June 2024, Paper 2, Q8 (1 mark): The CFC CCl 2F2 can cause the breakdown of ozone in the upper atmosphere. Which initiation step could occur with ultraviolet radiation to catalyse this breakdow
- November 2021, Paper 2, Q17(a) (3 marks): Freon-13, is a CFC with the molecular formula CCl F3. In the upper atmosphere, the presence of Freon-13 can lead to ozone depletion. Explain, with the aid of eq
- June 2018, Paper 2, Q8 (1 mark): The breakdown of ozone is catalysed by NO radicals. Which equation is a propagation step in the mechanism for this process? A NO + O2 → N + O3 B NO + O2 → NO2 +
- June 2016, AS Paper 2, Q4(c) (2 marks): NO radicals catalyse the breakdown of ozone in the stratosphere. Write two equations to show how NO radicals catalyse this breakdown. [2]
Questions, mark schemes and examiner’s reports are © OCR, from their published past papers. Plumi isn’t affiliated with any exam board. Want whole papers? OCR A-Level Chemistry A past papers, or our free OCR-style practice pack.
The Plumi iPad app also offers exam-style questions with AI feedback on your handwritten working.