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Chemistry · May / June 2019 · Paper 12 · Question 31

5070Air quality and climate

Which statement about some of the gases present in air is correct?

  1. ADry air contains about 78% of oxygen.
  2. BMethane is produced by the incomplete combustion of fossil fuels.
  3. CSulfur dioxide is released by volcanoes.
  4. DThe noble gases make up about 5% of dry air.

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Correct answer: C. Sulfur dioxide is released by volcanoes.

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