Consider the following:
1. Carbon monoxide
2. Nitrogen oxide
3. Ozone
4. Sulphur dioxide
Excess of which of the above in the environment is/are cause(s) of acid rain?
Correct Answer B. 2 and 4 only
Explanation
Correct answer: (b) 2 and 4 only
Nitrogen oxides and sulphur dioxide react with atmospheric moisture to form nitric and sulphuric acid, which fall as acid rain. Carbon monoxide and ozone contribute to other pollution problems (smog, respiratory irritation) but are not acid-rain precursors.