Discussion
Acid deposition arises chiefly from atmospheric transformation of
Answer: C
Correct answer: Sulphur dioxide and oxides of nitrogen
Acid deposition arises when sulphur dioxide and oxides of nitrogen are oxidised in the atmosphere to sulphuric and nitric acid. Because the transformation takes hours to days, the acids travel hundreds or thousands of kilometres before being deposited in rain, snow or as dry deposition - which is what makes acid rain an international rather than a local problem.
Carbon monoxide and methane do not form strong acids; lead and mercury are toxic metals with quite different pathways; and ozone and volatile organic compounds belong to the photochemical smog problem.
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