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Chemistry · May / June 2023 · Paper 12 · Question 33

5070Air quality and climate

Which statement about air pollutants is correct?

  1. ACatalytic converters in vehicles change a toxic gas into a non-toxic gas.
  2. BFlue gas desulfurisation uses calcium nitrate.
  3. CPhotosynthesis is a process that releases carbon dioxide.
  4. DSulfur dioxide is responsible for photochemical smog.

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Correct answer: A. Catalytic converters in vehicles change a toxic gas into a non-toxic gas.

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