Ncert Exercises & Solutions

The incorrect statements about classical smog among the following is:

1.	Its main components are produced by the action of sunlight on emissions of automobiles and factories
2.	Produced in a cold and humid climate
3.	It contains compounds of reducing nature
4.	It contains smoke, fog, and sulfur dioxide

Hint: Classical smog are not produced by the action of sunlight on emissions of automobiles and factories

Smog is of two types-classical smog and photochemical smog.

Classical smog is formed when there is a high concentration of sulfur dioxide and particulate matter produced due to the

combustion of fuels. Classical smog occurs in a cold humid climate

It is a mixture of smoke, fog, and sulphur dioxide. Chemically it is a reducing a mixture that is why it is also called reducing smog.

Photochemical smog occurs in warm, dry, and sunny climates. The main components of the photochemical smog result from the action of sunlight on unsaturated hydrocarbons and nitrogen oxides produced by automobiles and factories.

Hence, option one is the correct answer.

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