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a
PAN is formed in a chain reaction
b
PAN is a product of photochemical smog
c
NO2 contributes to haze
d
All of the above are correct statements
answer is D.
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Detailed Solution
Un burnt fuel and NO are emitted from automobiles . In presence of sunlight, NO changes to NO2 which in turn absorbs energy from sunlight and breaks up into NO and O and a chain reaction starts.HC(Hydrocarbon, fuel) +O3→HCHO+CH2=CHCHO