plumiSustainability: OCR A‑Level Chemistry B questions
Every OCR A-Level Chemistry B exam question on DF Sustainability (specification points DF(u)), 2016–2025, with its mark scheme and examiner’s report.
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Calculations
Q3(d)
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Q32(e)
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Q3(b)(iii)
The whole paper ↗![June 2023 Paper 2, question 3(b)(iii): A student says that producing hydrogen by electrolysis is not ‘green’ because fossil fuels are used to make the electricity. Discuss this statement. [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h43302-jun23-03-biii-qp.webp?v=3)
Q1(h)
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All 9 questions on Sustainability, as a list
- June 2025, Paper 1, Q8 (1 mark): What is an advantage of both ethanol and hydrogen as alternatives to petrol? A Their only product of combustion is water. B They can be produced by fermentation
- June 2025, AS Paper 1, Q10 (1 mark): What is a disadvantage of using hydrogen rather than methane for burning in home gas boilers? A Hydrogen can be made by electrolysis of water using alternative
- June 2024, Paper 1, Q21 (1 mark): Wood is used to make a sample of bioethanol. The bioethanol is used to fuel a car engine. What is correct? A Carbon dioxide is the only pollutant produced by th
- June 2024, AS Paper 2, Q3(d) (2 marks): A student says that biodiesel is both sustainable and carbon neutral because it is made from vegetable oils. Comment on the validity of both parts of this state
- June 2023, Paper 1, Q32(e) (3 marks): The ethanol that is mixed with fossil fuels in petrol can be made by fermentation of crops. A student says that this ethanol is carbon neutral in petrol. Discus
- June 2023, Paper 2, Q3(b)(iii) (2 marks): A student says that producing hydrogen by electrolysis is not ‘green’ because fossil fuels are used to make the electricity. Discuss this statement. [2]
- November 2020, AS Paper 1, Q9 (1 mark): What is a disadvantage of using biofuels, compared to fossil fuels? A Biofuels are more toxic. B Biofuels give off CO2 when they burn. C Biofuels give off SO2 w
- June 2019, AS Paper 1, Q15 (1 mark): A student says that bio-ethanol is carbon neutral. Which option provides evidence that disagrees with the student’s statement about bio-ethanol? A It gives off
- June 2019, AS Paper 2, Q1(h) (6 marks): Catalytic cracking of hydrocarbons is carried out in the petrochemical industry. Hot vaporised hydrocarbons and a powdered catalyst are fed into the bottom of a
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