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Question

Which of the following statements about photochemical smog is not correct?

A
It occurs in warm, dry and sunny climate.
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B
Chemically, it is a reducing mixture and is called reducing smog.
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C
It is formed as a result of action of sunlight on unsaturated hydrocarbons and nitrogen oxides.
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D
It has high concentration of oxidising agents and is also called oxidising smog.
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Solution

The correct option is C Chemically, it is a reducing mixture and is called reducing smog.
Chemical reaction between the UV radiation and the atmospheric pollutant like hydrocarbons, nitrogen oxides causes photochemical smog. So, photochemical smog occurs is the presence of sunlight in the warm and dry climate and photochemical smog is also referred to as summer smog and not reducing smog.

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