Question

Photochemical smog pollution does not contain

• A. PAN (peroxyacyl nitrate)
• B. Ozone
• C. Nitrogen dioxide
• D. Sulphur dioxide

Answer 1

The correct option is D Sulphur dioxide

Photochemical smog formed by action of sunlight on unsaturated hydrocarbons and nitrogen oxides.
Nitrogen oxides split into nitric oxide and nascent oxygen.
$N{O}_2\left(g\right)\stackrel{h\nu }{\to }NO\left(g\right)+O\left(g\right)$
Nascent oxygen forms ozone.
$O\left(g\right)+O_2\left(g\right)\rightleftharpoons O_3\left(g\right)$
$C{H}_4+O_3\to \underset{PAN}{3C{H}_3\underset{\underset{O}{|}|}{C}OON{O}_2}$
So, photochemical smog contains $O_3,N{O}_2,$ PAN.
Hence, the correct answer will be option (d).