. Acid precipitation is now regarded as a serious problem in
some European and Asian countries. Its major cause or source is
(a) Discharge of acidic effluents onto neutral or slightly
alkaline land where the acidic components precipitate
(b) Emissions of sulphur oxides and nitrogen oxides from
thermal power plants and burning of fossil fuels; these
oxides dissolve in atmospheric water vapour and fall back on
earth as acid rain
(c) Neutral carbon dioxide released during respiration of
living organisms dissolves in water, forming carbonic acid
which is the chief contributor to acidity in rain water.
(d) Chlorofluorocarbons readily react with various chemicals
near the earth’s surface, producing acidic intermediates
which cause acid precipitation.
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Answer / guest
(b) Emissions of sulphur oxides and nitrogen oxides from
thermal power plants and burning of fossil fuels; these
oxides dissolve in atmospheric water vapour and fall back on
earth as acid rain
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