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Photochemical Smog

The photochem...

Question

The photochemical smog is formed by.

A

Nitrogen oxides

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B

Hydrocarbons

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C

Nitrogen oxides and hydrocarbons

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D

Solar radiations upon nitrogen oxides and hydrocarbons

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Solution

The correct option is D Solar radiations upon nitrogen oxides and hydrocarbons
Photochemical smog is a mixture of pollutants that are formed when nitrogen oxides and volatile organic compounds (VOCs) react to sunlight, creating a brown haze above cities. It tends to occur more often in summer, because of most sunlight.
So, the correct option is 'Solar radiations upon nitrogen oxides and hydrocarbons'.

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Reason: Vehicular polIution is a major source of nitrogen oxides.

Q. Read the following statements regarding the PAN (peroxyacyl nitrates) and select the correct ones.
(i) It is a secondary pollutant present in photochemical smog.
(ii) It is produced by photochemical reactions between hydrocarbons and nitrogen oxides in the presence of sunlight of UV radiations.
(iii) It is thermally unstable and decomposes into peroxyethanoyl radicals and nitrogen dioxide gas.
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Photochemical Smog

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