Q.

The smog is essentially caused by the presence of

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a

O2 and O3

b

O2 and N2

c

Oxides of sulphur and nitrogen

d

O3 and N2

answer is C.

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Detailed Solution

Smog is a kind of air pollution. Originally named for the mixture of smoke and fog in the air. This smog mainly caused by oxides of sulphur and nitrogen like SO2​, N2​O, NO, NO2​, etc.
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