The gases in air which form acid rain are ____.

_{x}

and CFC

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CFC and SO

_{x}

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_{x}

and SO

_{x}

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CFC and NO

_{x}

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Solution

The correct option is C NO $_{x}$ and SO $_{x}$
The gases in air which form acid rain are NO $_{x}$ and SO $_{x}$ . (x stands for the number 1, 2, or 3). It may be sulphur dioxide or trioxide, carbon monoxide or dioxide, and nitrogen monoxide, dioxide, or trioxide. It is only oxides of nitrogen and sulphur in air that combine with water to form acid rain.
The reactions are:
NO + O $_{3}$ → NO $_{2}$
NO $_{2}$ + O $_{3}$ → NO $_{3}$
NO $_{3}$ + NO $_{3}$ → N $_{2}$ O $_{5}$
N $_{2}$ O $_{5}$ + H $_{2}$ O → HNO $_{3}$
SO $_{2}$ + O $_{2}$ → SO $_{3}$ (in the presence of NO or metal ions)

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Question 15
Name two gases which are mainly responsible for acid rain?

Name any two :

(a) natural sources of atmospheric polluction.

(b) gases which are responsible for the formation of acid rain.

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