Q. Consider the following differences between classical smog and photochemical smog:
- While classical smog occurs in cool humid climate, photochemical smog occurs in dry sunny climate
- While classical smog is reducing in nature, photochemical smog is oxidizing in nature
Which of the above statements is/are correct?
Answer:
Both 1 & 2
Notes:
- Correct - Classical smog tends to occur in cool, humid climates, while photochemical smog is more common in warm, dry, sunny climates. This is because photochemical smog is produced by reactions between sunlight, nitrogen oxides (NOx) and volatile organic compounds (VOCs). The sunlight and heat help drive the photochemical reactions that form photochemical smog.
- Correct - Classical smog has a reducing nature as it contains sulfur dioxide which can act as a reducing agent. On the other hand, photochemical smog has an oxidizing nature due to ozone and other oxidizing components produced by the photochemical reactions.