Explanation
- A
1, 2 and 3
1, 2 and 3. CO and ozone are not the classic acid-rain pair.
- B
2 and 4 only
2 and 4 only. Nitrogen oxides and sulphur dioxide → nitric and sulphuric acids in rain. Not CO, not ozone as the acid-rain cause.
- C
4 only
4 only. NOx is also a driver.
- D
1, 3 and 4
1, 3 and 4. Carbon monoxide is not an acid-rain precursor here.
Summary. Official key is (b) 2 and 4 only. Acid rain is chiefly from SO2 and NOx. Carbon monoxide and ozone are air pollutants with other harms, not the acid-rain couple in this list.
Same topic · past papers
UPSC has asked this before
These previous-year questions sit on the same topic. Open one to practise the earlier ask.
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