When pH of rain water is below 5.6 then it is acid rain. Acid rain is a by-product of a variety of human activities that emit the oxides of sulphur and nitrogen in the atmosphere.
2SO2 (g) + O2 (g) + 2H2O (l) → 2H2SO4 (aq)
4NO2 (g) + O2 (g)+ 2H2O (l) → 4HNO3 (aq) . Nitric acid and sulphuric acid are acids present in acid rain.
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