Photochemical smog occurs in a warm, dry and sunny climate. One of the following is not amongst the components of components of photochemical smog. Identify it

N O_{2}

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O_{3}

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S O_{2}

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Unsaturated hydrocarbons

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Solution

The correct option is A $S O_{2}$
$S O_{2}$ is the components of classical smog (i.e.; reducing smog) while unsaturated hydrocarbons, nitrogen oxides and ozone are the components of photochemical smog (i.e.; oxidising smog)
Hence option (C) is correct.

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