Question

Acid rain is caused due to increase in concentration of

• A. $S{O}_{2}andN{O}_2$
• B. $COandC{O}_2$
• C. $COandS{O}_2$
• D.
  Ozone and dust

Answer 1

The correct option is A $S{O}_{2}andN{O}_2$

Acid rain refers to the precipitation with a pH of less than 5. It is a mixture of H${}_2$SO${}_4$ and HNO${}_3$, the ratio of the two acids vary depending on the relative quantities of sulphur oxides and nitrogen oxides present in the atmosphere. These oxides are mainly produced by combustion of fossil fuels, smelters, industries, power plants, automobile exhausts etc. SO${}_2$ and NO when present in large quantities dissolved in water vapour form sulphuric acid and nitric acid which dissolve in rain water resulting in acid rain (H${}_2$SO${}_4$ ) and (HNO${}_3$) which in turn causes great damage to forests and vegetation.

Therefore, the correct answer is option A.