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A.
1/4
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B.
16
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C.
1
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D.
1/16
Correct Answer:
B. 16
Explanation:
Nitrogen dioxide (NO2) acts as the primary catalyst for photochemical smog because it initiates the chemical sequence required for its formation. When NO2 absorbs solar ultraviolet radiation, it undergoes photodissociation, splitting into nitric oxide and a highly reactive individual oxygen atom. This free oxygen atom then interacts with molecular oxygen in the air to produce ground-level ozone, the hallmark of smog. While ozone and other pollutants like peroxyacetyl nitrates (PAN) are major constituents of the resulting haze, they are secondary products that depend entirely on the initial breakdown of NO2. Consequently, nitrogen dioxide is the indispensable precursor that triggers the entire smog-producing process.
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