Consider the following:

1. Oxides of Hydrogen
2. Oxides of Nitrogen
3. Oxides of Sulphur

Which of the above cause or causes acid rain?

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

Explanation

Option (c) is correct

• Acid rain is mainly caused by the presence of oxides of nitrogen (NOₓ) and oxides of sulphur (SO₂, SO₃) in the atmosphere. These gases react with water vapour, oxygen, and other chemicals in the atmosphere to form acids such as nitric acid and sulphuric acid, which then fall as acid rain.Oxides of Hydrogen (such as water vapour) do not cause acid rain.

Answer: (c) 2 and 3 only