Q.

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.

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(I) only

(II) and (III)

(I) and (IV)

(IV) only

answer is 2.

(Detailed Solution Below)

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Detailed Solution

SO2 + 12 O2 + H2O ⟶ H2SO42NO2 + 12 O2 + H2O ⟶ 2HNO3

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