MCQ
The acids present in acid rain are $ .........$
- APeroxyacetylnitrate.
- ✓$\mathrm{H}_2 \mathrm{CO}_3$
- C$\mathrm{HNO}_3$
- D$\mathrm{H}_2 \mathrm{SO}_4$
✓
Answer
Correct option: B.
$\mathrm{H}_2 \mathrm{CO}_3$
Rain water has a $\ce{pH}$ of $5.6$ due to the presence of $H^+$ ions formed by the reaction of rain water with carbon dioxide present in the atmosphere.
$\text{H}_2\text{O}\text{(l)}+\text{CO}_2\text{(g)}\xrightarrow{ \ \ \ \ \ \ }\text{H}_2\text{CO}_3\text{(aq)}$
$\text{H}_2\text{CO}_3\text{(aq)}\xrightarrow{ \ \ \ \ \ \ }\text{H}^+\text{(aq)}+\text{H}\text{CO}_3\text{(aq)}$
When the $\ce{pH}$ of the rain water drops below $5.6,$ it is called acis rain. $\ce{SO_2}$ and $\ce{NO_2}$ after oxidation and reaction with water are major contributors to acid rain.
$2\text{SO}_2\text{(g)}+\text{O}_2\text{(g)}+2\text{H}_2\text{O}\text{(l)}\xrightarrow{ \ \ \ \ }2\text{H}_2\text{SO}_4\text{(aq)}$
$4\text{NO}_2\text{(g)}+\text{O}_2\text{(g)}+2\text{H}_2\text{O}\text{(l)}\xrightarrow{ \ \ \ \ }4\text{HNO}^{-}_{3}\text{(aq)}$
$\text{H}_2\text{O}\text{(l)}+\text{CO}_2\text{(g)}\xrightarrow{ \ \ \ \ \ \ }\text{H}_2\text{CO}_3\text{(aq)}$
$\text{H}_2\text{CO}_3\text{(aq)}\xrightarrow{ \ \ \ \ \ \ }\text{H}^+\text{(aq)}+\text{H}\text{CO}_3\text{(aq)}$
When the $\ce{pH}$ of the rain water drops below $5.6,$ it is called acis rain. $\ce{SO_2}$ and $\ce{NO_2}$ after oxidation and reaction with water are major contributors to acid rain.
$2\text{SO}_2\text{(g)}+\text{O}_2\text{(g)}+2\text{H}_2\text{O}\text{(l)}\xrightarrow{ \ \ \ \ }2\text{H}_2\text{SO}_4\text{(aq)}$
$4\text{NO}_2\text{(g)}+\text{O}_2\text{(g)}+2\text{H}_2\text{O}\text{(l)}\xrightarrow{ \ \ \ \ }4\text{HNO}^{-}_{3}\text{(aq)}$
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