First slide
Tropospheric pollution
Question

Acid rain appears when

(I) CO2 dissolves in rain water.
(II) Oxides of sulphur dissolve in rain water.
(III) Oxides of nitrogen dissolve in rain water.
(IV) Hydrocarbons dissolve in rain water.

Easy
Solution

SO2 + 12 O2 + H2O  H2SO4

2NO2 + 12 O2 + H2O  2HNO3

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