Which of the following is true about photochemical smog?

It is reducing in nature

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It is formed in winter

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It is a mixture of smoke and fog

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It causes irritation in eyes

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Solution

The correct option is D It causes irritation in eyes
The reaction of sunlight with hydrocarbons and ${N O}_{2}$ results in a variety of chemical products. One of these is ozone, made up of 3 atoms of oxygen,which is an irritating noxious gas. Other undesirable chemicals such as aldehydes also result from this photochemical reaction. This type of smog is oxidizing in character because of the presence of ozone,nitrogen dioxide and some photochemical oxidants.

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