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Question:

The molecule that has minimum/no role in the formation of photochemical smog is: CH2=O, O3, NO, N2

CH2=O

N2

O3

NO

Solution:

Chiefly NO2, O3 and hydrocarbon is responsible for the build-up smog. Apart from these other compounds which are responsible for photochemical smog is HCHO, O3, and NO.