Photochemical smog consists of an excessive amount of X, in addition to aldehydes, ketones and peroxyacetylnitrates (PAN). X is:

C H_{4}

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C O

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C O_{2}

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O_{3}

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Solution

The correct option is D $O_{3}$
The chemical pollutants in photochemical smog are nitrogen oxides $(N O a n d N O_{2})$ , volatile organic compounds, ozone, PAN etc.
In the presence of sunlight the following reactions take place:

$N O_{2} h v - \to N O + O$
$O + O_{2} ⟶ O_{3}$

Hence, it has an excessive amount of ozone molecules.

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