Photochemical smog consists of an excessive amount of X, in addition to aldehydes, ketones and peroxyacetylnitrates (PAN). X is:
A
CH4
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B
CO
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C
CO2
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D
O3
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Solution
The correct option is DO3 The chemical pollutants in photochemical smog are nitrogen oxides (NOandNO2), volatile organic compounds, ozone, PAN etc. In the presence of sunlight the following reactions take place:
NO2hv−→NO+O O+O2⟶O3
Hence, it has an excessive amount of ozone molecules.