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JEE Main levelOne or more correct optionsDifficulty 2 of 3ev028

Which of the following statements about classical (London type) smog are correct?

AIt forms in hot, sunny, dry weather and needs sunlight to start.
BIt consists of smoke, fog and sulphur dioxide.
CIt has a reducing character.
DIts formation is initiated by the photolysis of $NO X_{2}$ .

Answer: B, C

Classical smog is a mixture of coal smoke, fog and

SO X_{2}

and is reducing. It occurs in cool humid weather without a photochemical start, so the last two statements describe photochemical smog and are false.

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