Question

Which one of the following statements related to photochemical smog is not correct?

• A. It is controlled by the use of catalytic converters in automobiles.
• B. It causes corrosion of metals.
• C. It is a mixture of SO$_2$, smoke, and fog.
• D. It causes extensive damage to plant life.

Hint:

Photochemical smog: NO$_x$, O$_3$, VOCs + sunlight. Not primarily SO$_2$.

Answer 1

The Correct Option is C

Photochemical smog is primarily a mixture of nitrogen oxides (NO$_x$), ozone (O$_3$), volatile organic compounds (VOCs), and other pollutants. It is formed by the action of sunlight on these pollutants. While SO$_2$ can contribute to other types of smog (like industrial smog), it is not a primary component of photochemical smog. The other options are true: catalytic converters help reduce NO$_x$ emissions, photochemical smog can corrode metals, and it can damage plant life.