Discussion
Which of the following is produced during the formation of photochemical smog ?
Answer: A
Ozone is produced in photochemical smog.
Sunlight splits nitrogen dioxide from vehicle exhaust, \[\mathrm{NO_2 + h\nu \rightarrow NO + O},\qquad \mathrm{O + O_2 \rightarrow O_3}\] and the ozone then reacts with unburnt hydrocarbons to give PAN and aldehydes. Hydrocarbons and nitrogen oxides are the ingredients rather than the products.
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