Question

Acid rain occurs above the area where

• A. There is excess release of $N{H}_3$ and coal gas
• B. Factories are expelling $S{O}_2$ into air
• C. There is excess production of $C{O}_2$ due to excessive combustion and respiration
• D. There is excess production of gaseous hydrocarbons

Answer 1

The correct option is B Factories are expelling $S{O}_2$ into air

Acid rain is a result of a chemical reaction occurring in a localized area where the concentration of the oxides of nitrogen and sulphur are high. An area where there are factories will have an accumulation of sulphur dioxide in the air. These oxides react with water and precipitate in the form of the acid rain. For example, around the Taj Mahal area, the presence of the Mathura Refinery has caused multiple events of acid rain.

Hence, the correct answer is 'Factories are expelling SO${}_2$ into air'.