UPSC Previous Year Question | Prelims GS | 2022

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?

  1. 1, 2 and 3
  2. 2 and 4 only
  3. 4 only
  4. 1, 3 and 4

Answer

Correct Answer

2 and 4 only

Explanation

Excess nitrogen oxides and sulphur dioxide in the atmosphere react with water vapour to form nitric and sulfuric acids, causing acid rain. Carbon monoxide and ozone are not primary contributors to acid rain formation.

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