Which of the following pairs is secondary precursors of photochemical smog – Options: A . &nbsp S O 2 a n d N O 2 B . &nbsp S O 2 and hydrocarbons C . &nbsp N O 2 and hydrocarbons D . &nbsp O 3 and PAN

Which of the following pairs is secondary precursors of photochemical smog &#x

Question -

Which of the following pairs is secondary precursors of photochemical smog –

Options:

A .

S O_{2} a n d N O_{2}

B .

S O_{2}

and hydrocarbons

C .

N O_{2}

and hydrocarbons

D .

O_{3}

and PAN

Answer: Option D
:
D

Photochemical smog does not contain $S O_{2}$ . Hence we straight away discard options (a) and (b).

$N O_{2}$ and hydrocarbons are primary precursors while $O_{3}$ , PAN, Formaldehyde, and Acrolein are secondary precursor of photochemical smog.

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