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14.7.    Write down the reactions involved during the formation of photochemical smog.

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Following reaction are involved during the formation of photochemical smog-

It is formed by the reaction of sunlight with hydrocarbons and nitrogen oxides. Burning of hydrocarbons leads to release of nitrogen oxide in the atmosphere and high concentration of these pollutants, a chain reaction by the interaction with sunlight.

NO_2(g)\overset{h\nu }{\rightarrow}NO(g)+O(g)...........................(i)
Oxygen atoms are very reactive and combine with the dioxygen to produce ozone.

O(g)+O_3(g)\rightleftharpoons O_3(g)..................................(ii)
It rapidly reacts with NO, formed in the first reaction and regenerate NO_2(g)

NO(g)+O_{3}\rightarrow NO_2(g)+O_{2}(g)

Both NO_2 and ozone are oxidising in nature so they react with the unburnt hydrocarbon in the air to form PAN, formaldehyde and acrolein.

 3CH_{4}+2O_{3}\rightarrow 3CH_{2}=O+3H_{2}O

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