MCQ
Acid rain is caused due to increase in concentration of :
- ✓$\ce{SO_2}$ and $\ce{NO_2}$
- B$\text{CO}$ and $\ce{CO_2}$
- C$\text{CO}$ and $\ce{SO_2}$
- DOzone and dust
✓
Answer
Correct option: A.
$\ce{SO_2}$ and $\ce{NO_2}$
Acid rain refers to the precipitation with a $\ce{pH}$ of less than $5$. It is a mixture of $\ce{H_2SO_4}$ and $\ce{HNO_3},$ 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. $\ce{SO_2}$ and $\text{NO}$ when present in large quantities dissolved in water vapour form sulphuric acid and nitric acid which dissolve in rain water resulting in acid rain $\ce{(H_2SO_4)}$ and $\ce{(HNO_3)}$ which in turn causes great damage to forests and vegetation.
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