Discussion
Acid rain is due to air pollution by ?
Answer: D
Acid rain is caused by oxides of nitrogen and sulphur dioxide.
\(\mathrm{SO_2}\) from burning coal and \(\mathrm{NO_x}\) from vehicle engines are oxidised in the air and dissolve in rain: \[\mathrm{2SO_2 + O_2 + 2H_2O \rightarrow 2H_2SO_4},\qquad \mathrm{4NO_2 + O_2 + 2H_2O \rightarrow 4HNO_3}\] Rain below about pH 5.6 counts as acid rain.
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