Which of the following chemicals is not invol | vedclass

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(A) Photochemical smog is formed by the reaction of sunlight,nitrogen oxides $(NO_x)$,and volatile organic compounds $(VOCs)$ in the atmosphere.The pr

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$SO_2$

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(A) Photochemical smog is formed by the reaction of sunlight,nitrogen oxides $(NO_x)$,and volatile organic compounds $(VOCs)$ in the atmosphere.The primary reactions involved are:$(I)$ $NO + O_2 \longrightarrow NO_2$$(II)$ $NO_{2(g)} \stackrel{h 
u}{\longrightarrow} NO_{(g)} + [O]$$(III)$ $[O] + O_2 \longrightarrow O_3$$(IV)$ $O_3 + NO \longrightarrow NO_2 + O_2$$SO_2$ is primarily associated with classical (sulfurous) smog,not photochemical smog.

Which of the following chemicals is not involved in photochemical smog formation?

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