Which of the following are the constituents of photochemical smog?

Aldehydes

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Peroxyacyl nitrates

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Volatile hydrocarbons

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All of the above

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Solution

The correct option is D All of the above
Photo-chemical smog: Formed by the action of sunlight on unsaturated hydrocarbons and nitrogen oxides. This smog is also known as oxidising smog.
Emitted pollutants, hydrocarbons and $N O$ , interact with sunlight to give $N O_{2}$ . The $N O_{2}$ , again absorbs energy and breaks up into $N O and free O$ atoms.
$N O_{2} (g) h ν ⟶ N O (g) + O (g)$
Oxygen atoms are very reactive and combine with the $O_{2}$ in air to produce ozone.
Ozone is a toxic gas and both $N O_{2} and O_{3}$ are strong oxidising agents and can react with the unburnt hydrocarbons in the polluted air to produce chemicals such as formaldehyde, acrolein and peroxyacetyl nitrate (PAN).
$3 C H_{4} + O_{3} \to 3 H C H O ( Formaldehyde ) + 3 H_{2} O$
$3 C H_{4} + O_{3} \to C H_{2} = C H - C H O ( Acrolein )$
$C H_{4} + O_{3} \to 3 C H_{3} C O O O N O_{2} ( Peroxyacetyl nitrate (PAN))$

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Which of the following reaction results in photochemical smog?

H_{2} S O_{4}

C O_{2}

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