MCQ
In acid rain, sulphuric acid accounts for :
- A$100\%$ of acid
- ✓$70\%$ of acid
- C$50\%$ of acid
- D$30\%$ of acid
✓
Answer
Correct option: B.
$70\%$ of acid
Acid rain is acidic with a $\ce{pH}$ of below $5.6$. Rain becomes acidic because of gases that dissolve in the rain. Approximately $70 \%$ of acid rain is a result of dissolved sulfur dioxide $\left(\mathrm{SO}_2\right)$, which forms sulphuric acid. The remaining $30 \%$ or so comes from various nitrogen oxides $($mostly $\mathrm{NO}_2$ and $\mathrm{NO}_3$, which has collectedly called $\mathrm{NO}_x )$. There are also a small percentage of hydrochloric acid and carbonic acid.
The equation is as follows :
Sulphuric acid when it joins with hydrogen atoms in the air :
$\mathrm{SO}_3(\mathrm{~g})+\mathrm{H}_2 \mathrm{O}(\mathrm{I})=\mathrm{H}_2 \mathrm{SO}_4(\mathrm{aq})$
In the air, the nitrogen ion becomes nitric or nitrous acid:
$\mathrm{NO}_2(\mathrm{~g})+\mathrm{H}_2 \mathrm{O} (\mathrm{I})=\mathrm{HNO}_3(\mathrm{aq})+\mathrm{HNO}_2(\mathrm{aq})$
The equation is as follows :
Sulphuric acid when it joins with hydrogen atoms in the air :
$\mathrm{SO}_3(\mathrm{~g})+\mathrm{H}_2 \mathrm{O}(\mathrm{I})=\mathrm{H}_2 \mathrm{SO}_4(\mathrm{aq})$
In the air, the nitrogen ion becomes nitric or nitrous acid:
$\mathrm{NO}_2(\mathrm{~g})+\mathrm{H}_2 \mathrm{O} (\mathrm{I})=\mathrm{HNO}_3(\mathrm{aq})+\mathrm{HNO}_2(\mathrm{aq})$
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