Question

Photochemical smog always contains

• A. Ozone
• B. Methane
• C. Phosphorus
• D. Aluminium ions

Answer 1

The correct option is A

Ozone

The explanation for the correct answer:-

Photochemical smog:-

1. It is the chemical reaction of the sunlight, nitrogen oxides and volatile organic compounds.
2. It basically depends upon the primary pollutants as well as the formation of the secondary pollutants.
3. The primary pollutants consist of nitrogen oxides, nitric oxides ($\mathrm{NO}$) and nitrogen dioxide (${\mathrm{NO}}_2$) and other volatile organic compounds.
4. This smog is basically formed when the pollutants such as nitrogen oxides and organic compounds (primary pollutants) will react together in the presence of sunlight and a gas called ozone (secondary pollutant) is formed.

Therefore, the correct answer is (A):- Ozone