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Chemistry · May / June 2021 · Paper 11 · Question 34

5070Air quality and climate

Which statement about gases in the atmosphere is correct?

  1. ACarbon monoxide is a pollutant which causes acid rain.
  2. BCatalytic converters reduce carbon monoxide to carbon dioxide.
  3. CMethane in the atmosphere depletes the ozone layer.
  4. DPhotosynthesis adds oxygen to the atmosphere.

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Correct answer: D. Photosynthesis adds oxygen to the atmosphere.

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