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Photochemical smog consists of excessive amount of X, in addition to aldehydes, ketones, peroxyacetyl nitrate (PAN), and so forth X is:

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Photochemical smog consists of excessive amount of X, in addition to aldehydes, ketones, peroxyacetyl nitrate (PAN), and so forth X is:

(a) CO

(b) CH4

(c) O3

(d) CO2

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Correct answer: (c) O3

Explanation:

Chemical pollutants in photochemical smog are nitrogen oxides (NO and NO2), volatile organic compounds, ozone (O3) and peroxyacetyl nitrate.

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