Chemistry of the environment: past paper questions

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• Question 17May/June 2026, paper 11Multiple choice1 mark

  Which statement about cobalt(II) chloride and copper(II) sulfate is correct?

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• Question 26Oct/Nov 2025, paper 11Multiple choice1 mark

  Which statement about water is correct?

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• Question 31Oct/Nov 2024, paper 11Multiple choice1 mark

  Which statement describes clean, dry air?

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• Question 14Oct/Nov 2023, paper 11Multiple choice1 mark

  Solid S changes colour from white to blue when water is added. What is S?

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• Question 31May/June 2026, paper 11Multiple choice1 mark

  Why is distilled water used in practical chemistry rather than tap water?

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• Question 29Oct/Nov 2025, paper 11Multiple choice1 markHas a diagram

  Which row identifies an adverse effect of the named pollutant?

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• Question 32Oct/Nov 2024, paper 11Multiple choice1 mark

  Which word equation describes photosynthesis?

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• Question 28Oct/Nov 2023, paper 11Multiple choice1 mark

  Which test is used to show that a sample of water is pure?

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• Question 32May/June 2026, paper 11Multiple choice1 mark

  An NPK fertiliser is made by mixing two compounds. One of the compounds is $\mathrm{C}\mathrm{a}({\mathrm{H}}_2{\mathrm{P}\mathrm{O}}_4{)}_2$. What is the other compound?

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• Question 31Oct/Nov 2025, paper 12Multiple choice1 markHas a diagram

  Clean, dry air contains nitrogen, oxygen and small amounts of other gases. The noble gases have been left out of the table. Which row shows the composition of clean, dry air?

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• Question 33Oct/Nov 2024, paper 11Multiple choice1 mark

  Some adverse effects caused by air pollutants are listed. ● acid rain ● photochemical smog ● respiratory problems Which air pollutant contributes to all three of these adverse effects?

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• Question 29Oct/Nov 2023, paper 11Multiple choice1 mark

  Which mixture of salts produces an NPK fertiliser?

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• Question 33May/June 2026, paper 11Multiple choice1 markHas a diagram

  Which row identifies the reactants and products of photosynthesis?

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• Question 32Oct/Nov 2025, paper 12Multiple choice1 mark

  Some substances found in water from natural sources are potentially harmful. Which substance contains microbes that cause disease?

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• Question 18Oct/Nov 2024, paper 12Multiple choice1 mark

  When a few drops of water are added to a solid, E, the colour changes from blue to pink. What is E?

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• Question 30Oct/Nov 2023, paper 11Multiple choice1 mark

  What are the main products obtained by the fractional distillation of liquid air?

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• Question 16May/June 2026, paper 12Multiple choice1 mark

  Farmers add calcium oxide (lime) and ammonium salts to their fields. The compounds are not added at the same time because they react with each other. Which gas is produced in this reaction?

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• Question 33Oct/Nov 2025, paper 12Multiple choice1 markHas a diagram

  Gas X is a waste gas from digestion in animals. Gas Y is formed when gas X is burned with an insufficient amount of oxygen. Gas Z is formed when gas X is burned with an excess of oxygen.

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• Question 32Oct/Nov 2024, paper 12Multiple choice1 mark

  Which substances in water from natural sources are beneficial to aquatic animals?

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• Question 35Oct/Nov 2023, paper 11Multiple choice1 mark

  What is the approximate volume of nitrogen in $200{\text{ cm}}^3$ of air?

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• Question 24May/June 2026, paper 12Multiple choice1 mark

  Which alkali and acid react to produce a salt in which both the cation and anion are used to make a fertiliser?

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• Question 34Oct/Nov 2025, paper 12Multiple choice1 mark

  Which statement about photosynthesis is correct?

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• Question 31Oct/Nov 2024, paper 13Multiple choice1 mark

  Which pollutants found in river water lead to deoxygenation?

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• Question 2Oct/Nov 2023, paper 12Multiple choice1 mark

  Which statements about clean, dry air are correct?

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• Question 28May/June 2026, paper 12Multiple choice1 mark

  Water from natural sources may contain substances such as metal compounds, dissolved oxygen, phosphates and plastics. Which statement is correct?

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• Question 25Oct/Nov 2025, paper 13Multiple choice1 mark

  Four substances, or groups of substances, found in water from a natural source are listed.

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• Question 32Oct/Nov 2024, paper 13Multiple choice1 mark

  Three effects of air pollutants are listed. 1 photochemical smog 2 respiratory problems 3 acid rain Which effects are caused by oxides of nitrogen?

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• Question 16Oct/Nov 2023, paper 12Multiple choice1 mark

  Which reaction shows a colour change from white to blue?

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• Question 29May/June 2026, paper 12Multiple choice1 markHas a diagram

  Which row identifies the source and the adverse effect of the named pollutant?

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• Question 26Oct/Nov 2025, paper 13Multiple choice1 mark

  Which element is used to remove tastes and odours in the treatment of the domestic water supply?

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