Question

Photochemical smog consists of excessive amount of X in addition to aldehydes, ketones, PAN etc. X is:

• A. methane
• B. carbon monoxide
• C. carbon dioxide
• D. ozone.

Answer 1

Answer: (D)

ozone.

Photochemical smog is basically a mixture of bad chemicals. It consists of nitrogen oxides, ozone, volatile organic compounds and PAN. It is caused by air pollution.

$NO$ is oxidized in air to produce $N{O}_2$, which produces a free oxygen atom. This oxygen atom combines with oxygen to give ozone.

Hence, option D is correct.