Acid rain is caused by the pollution of environment by

1. carbon dioxide and nitrogen
2. carbon monoxide and carbon dioxide
3. ozone and carbon dioxide
4. nitrous oxide and sulphur dioxide

Explanation

Option (d) is correct

• Acid rain is primarily caused by the emission of sulphur dioxide (SO₂) and nitrogen oxides (NOₓ). These gases are released mainly from the burning of fossil fuels in industries, thermal power plants, and vehicles. Once in the atmosphere, they react with water vapour, oxygen, and other chemicals to form sulphuric acid and nitric acid, which then fall to the ground as acid rain.

Answer: (d) nitrous oxide and sulphur dioxide; Difficulty Level: Medium