Which of the following statements is not true about classical smog?

Its main components are produced by the action of sunlight on emissions of automobiles and factories.

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Produced in cold and humid climate.

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It contains compounds of reducing nature.

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It contains smoke, fog and sulphur dioxide.

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Solution

The correct option is A Its main components are produced by the action of sunlight on emissions of automobiles and factories.
Classical smog is the smog that occurs in cold and humid climate and it contains compounds like sulphur dioxide, particulate matter that are compounds of reducing nature. Option A is the definition of photochemical smog.

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