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The brown haze of photochemical smog is ...

The brown haze of photochemical smog is largely attributable to NO NO_2' CH_3COOONO_2' CH_2=CHCH=O

A

NO

B

NO_2'

C

CH_3COOONO_2'

D

CH_2=CHCH=O'

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The correct Answer is:
B
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