A-LevelChemistryNitrogen and sulfur9701/12 · May/June 2015 · Q181 Mark

Carbon monoxide, CO, nitrogen dioxide, NO₂, and sulfur dioxide, SO₂, are all atmospheric pollutants. Which reaction concerning these compounds occurs in the atmosphere?

ACO is spontaneously oxidised to CO₂

BNO₂ is reduced to NO by CO

CNO₂ is reduced to NO by SO₂

DSO₂ is oxidised to SO₃ by CO₂

✓ Correct answer

C: NO₂ is reduced to NO by SO₂

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Topic: Nitrogen and sulfur, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2015 Paper 1 Variant 2, question 18.

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