Which one of the following air pollutant is responsible for acid rain ?
SO2
Acid rain is rain, snow or fog whose pH is below about 5.6 because acids have formed in the atmosphere.
Sulphur dioxide, released mainly by burning coal and oil in power plants and industries, reacts with water vapour and oxygen to form sulphuric acid, \(\text{SO}_2 \rightarrow \text{H}_2\text{SO}_4\). Oxides of nitrogen form nitric acid in the same way. Sulphur dioxide is the principal air pollutant responsible for acid rain.
Carbon dioxide forms only the weak carbonic acid that gives normal rain its slight acidity, carbon monoxide does not form an acid in rain, and ozone is an oxidant linked to smog rather than to acid rain.
SO2 option is correct.
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