Excess of which of the following in the environment is/are cause(s) of acid rain? 1. Carbon monoxide 2. Nitrogen oxide 3. Ozone 4. Sulphur dioxide

Options

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

Correct Answer

2 and 4 only

Explanation

Acid rain results primarily from emissions of sulphur dioxide (SO₂) and nitrogen oxides (NOₓ), which react with water vapour to form acids.

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