Question

Which of the following is incorrect regarding smog?

• A. Classical smog occurs in cold and humid climate and is reducing in nature
• B. Photochemical smog occurs in warm, dry and sunny climate and it is oxidizing in nature
• C. Major constituent of photochemical smog is $S{O}_2$
• D. Classical smog is a mixture of smoke, fog and $S{O}_2$

Answer 1

The correct option is C Major constituent of photochemical smog is $S{O}_2$

Classical smog occurs in cold and humid climate. It is a mixture of smoke, fog and $S{O}_2$.
Chemically it is reducing in nature.
Photochemical smog occurs in warm, dry and sunny climate. It is oxidising in nature due to presence of high concentration of oxidising agents. Major constituents of photochemical smog result from the action of sunlight on unsaturated hydrocarbons and nitrogen oxides produced by automobiles and factories.