Which of the following air pollutants cause acid rain? Choose the correct answer from the options given below:

1.Nitric oxide

2.Nitrogen dioxide

3.Carbon monoxide

4.Sulphur dioxide

5.Methane

A1, 2, 3

B1, 2, 4 ✓ Correct

C2, 3, 4

D3, 4, 5

Correct answer: (B) 1, 2, 4

Explanation

Acid rain is caused by nitric oxide, nitrogen dioxide and sulphur dioxide, which turn into strong acids in the atmosphere.

Statement 1 is right because nitric oxide oxidises and contributes to nitric acid formation.

Statement 2 is right since nitrogen dioxide dissolves to form nitric acid in rainwater.

Statement 4 is right as sulphur dioxide forms sulphuric acid, the main acid rain component.

Statement 3 is wrong because carbon monoxide is a toxic gas but does not create acid rain.

Statement 5 is wrong because methane is a greenhouse gas and plays no part in acid rain.

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