Q.

The photochemical smog does not generally contain :

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a

SO2

b

NO

c

HCHO

d

NO2

answer is C.

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Detailed Solution

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Photochemical smog is the form of air pollution in which the pollutant reacts with the sunlight and forms smog which consists of PAN (Peroxyacetyl nitrate), nitrogen oxides, and other non-volatile compounds.

Carbon dioxide and sulphur dioxide are not involved in photo chemical smog. 

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