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  4. Photochemical smog consists of excessive amount of X , in addition to aldehydes, ketones, peroxy acetyl nitrile (.PAN.). X is:

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Q. Photochemical smog consists of excessive amount of $X$ , in addition to aldehydes, ketones, peroxy acetyl nitrile $\left(\right.PAN\left.\right).$ $X$ is:

NTA AbhyasNTA Abhyas 2022

Solution:

Photochemical smog is formed on the chemical reaction of sunlight, nitrogen oxides and volatile organic compounds in the atmosphere.
$\left(N O\right)_{2}\left(g\right)\overset{h v}{ \rightarrow }NO\left(g\right)+O\left(g\right)$
Oxygen atom (nascent) is very reactive and combines with $O_{2}$ in air to produce ozone.
$O\left(g\right)+O_{2}\left(g\right) \rightarrow O_{3}\left(g\right)$