JEE Main Chemistry question

Not in JEE Main or NEET syllabus

Pick out the correct statement. CO which is a major pollutant resulting from

(A)the combustion of fuels in automobiles plays a major role in photochemical smog.
(B)Classical smog has an oxidising character while photochemical smog is reducing in character.
(C)Photochemical smog occurs in day time whereas classical smog occurs in early morning hours.Correct
(D)During formation of smog the level of ozone in the atmosphere goes down.

Answer: (C)

Solution

Photochemical (Los Angeles-type) smog forms in warm, sunny, dry daytime conditions, while classical (London-type) smog forms in cool, humid, early-morning winter conditions, so (c) is true. (a) is false because CO itself does not drive the photochemical chain (that role

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Question ID VK-141879