Discussion
Acid rain is primarily caused by the emission of
Answer: B
Acid rain is caused mainly by sulphur dioxide and nitrogen oxides.
Sulphur dioxide from burning coal and oil, and nitrogen oxides from vehicles and power plants, react with water vapour and oxygen in the air to form sulphuric and nitric acids, which fall as acid rain:
\[ \begin{aligned} \text{SO}_2 &\rightarrow \text{H}_2\text{SO}_4 \\ \text{NO}_x &\rightarrow \text{HNO}_3 \end{aligned} \]
Carbon dioxide and methane are greenhouse gases; carbon dioxide forms only the weak carbonic acid present in all rain. Ozone and carbon monoxide are pollutants but not the main acid-formers, and ammonia is alkaline.
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