Question

A gaseous pollutant which dissolves in rainwater resulting in the formation of acid rain.

• A. Water vapour
• B. Carbon monoxide
• C. Sulphur dioxide
• D. Nitrogen

Answer 1

Answer: (C)

Sulphur dioxide react with water to form sulphurous acid while sulphur trioxide reacts with water to form sulphuric acid.

$S+O_2\to S{O}_2$

$S{O}_2+\frac{1}{2}{O}_2+H_{2}O\to H_{2}S{O}_4$

Oxides of sulphur coming from exhaust fumes react with rain water forming sulphuric acid which causes acidic rain. It is highly corrosive in nature causing yellowing of marble.

Option C is correct.