Which of the following air pollutants make rain water acidic?

1.Nitric oxide (NO)

2.Nitrogen dioxide (NO2)

3.Nitrous oxide (N2O)

4.Carbon monoxide (CO)

5.Sulphur dioxide (SO2)

A1, 2 & 5 only ✓ Correct

B2, 3 & 4 only

C1, 3 & 5 only

D1, 2 & 3 only

Correct answer: (A) 1, 2 & 5 only

Explanation

Acid rain forms when certain gases dissolve in rainwater to make sulphuric and nitric acids.

Statement 1 and Statement 2: nitric oxide and nitrogen dioxide oxidise to nitric acid.

Statement 5: sulphur dioxide converts to sulphuric acid in the atmosphere.

Statement 3: nitrous oxide is a greenhouse gas and does not acidify rain.

Statement 4: carbon monoxide does not form a strong acid in rain.

Acid deposition damages forests, lakes, soils and buildings.

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