Question:
The molecule that has minimum/no role in the formation of photochemical smog, is:
Correct Option: 1
Solution:
$\mathrm{NO}, \mathrm{O}_{3}$ and $\mathrm{HCHO}$ are responsible for the formation of photochemical smog while $\mathrm{N}_{2}$ has no role in photochemical smog.
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