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JEEMAIN and NEET
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JEEMAIN PAST PAPERS
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2015
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Q)
Photochemical smog consists of excessive amount of X, in addition to aldehydes, ketones, peroxy acetyl nitrile (PAN), and so forth. X is :
( A ) $CO_2$
( B ) $O_3$
( C ) $CH_4$
( D ) $CO$
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