Question

Consider the following statements
Statement-I: Oxides of sulphur and nitrogen are air pollutants
Statement-II: Photochemical smog is a reducing smog
The correct answer is

• A. Both statements I and II are correct
• B. Both statements I and II are not correct
• C. Statement I is correct, but statement II is not correct
• D. Statement I is not correct, but statement II is correct

Hint:

SO$_x$ and NO$_x$ are key pollutants; know their environmental impact. Photochemical smog is oxidizing due to ozone; reducing smog involves SO$_2$. Distinguish smog types by composition.

Answer 1

The Correct Option is C

1. Statement I: SO$_x$ (e.g., SO$_2$) and NO$_x$ (e.g., NO, NO$_2$) are major air pollutants, causing acid rain and health issues, so I is correct.
2. Statement II: Photochemical smog, formed from NO$_x$ and VOCs under sunlight, is oxidizing (produces O$_3$, oxidants), not reducing (like London smog with SO$_2$).
3. Thus, II is incorrect.
4. Therefore, the correct option is (3) Statement I is correct, but statement II is not correct.