Ncert Exercises & Solutions

From where does ozone come in the photochemical smog?

Sunlight cause photochemical decomposition of NO₂ into NO and O.

{NO}_{2} \overset{hv}{\to} NO + [O]

Atomic oxygen is a highly reactive species. It combines with diatomic oxygen and forms ozone.

O_{2} + O + M \to O_{3} + M

Where, M is inert gas such as nitrogen. This, O₃ is formed during the formation of smog.