Discussion
Which one of the following air pollutant is responsible for acid rain ?
Answer: A
Acid rain is caused by \(\mathrm{SO_2}\).
Sulphur dioxide from burning coal and oil reacts with water and oxygen in the atmosphere to form sulphuric acid, which falls as acid rain. Nitrogen oxides contribute in the same way by forming nitric acid.
Carbon dioxide forms only the weak carbonic acid that makes normal rain slightly acidic and is chiefly a greenhouse gas; carbon monoxide is a toxic gas and ozone a secondary pollutant, neither of them the cause of acid rain.
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