Write notes on : Acid rain

Explanation

(i) The term acid rain was given by Robort August. It is rainfall with a pH of less than 5.65.
(ii) Acid rain is a mixture of `H_2 SO_4` and `HNO_3` abd the ratio of the two may vary depending on the relative quantities of oxides of sulphur and nitrogen emitted on an average 60-70% of acidity is ascribed to `H_2SO_4` and 30-40 % to `HNO_3`.(iii) It damages foliage and growing points of plant. Causes leaching of essential minerals of soil lilke Ca, Mg, `NO_3^-` and `SO_4^(-2)`