Correct statement about classical smog (I) and photochemical smog (II) is:

Options

A. `I=` reducing smog, `II=` oxidizing smog
B. `I=` oxidizing smog, `II=` reducing smog
C. Both I and II are oxidizing smog
D. Bothe I and II are reducing smog

Explanation

To solve the question regarding the correct statements about classical smog (I) and photochemical smog (II), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definitions**:
- **Classical Smog**: This type of smog is typically formed in cool, humid conditions and is primarily composed of smoke, fog, and sulfur dioxide. It is often associated with industrial areas.
- **Photochemical Smog**: This smog occurs in warm, sunny conditions and is formed by the reaction of sunlight with pollutants such as volatile organic compounds (VOCs) and nitrogen oxides. It contains ozone and other oxidizing agents.

2. **Identify the Nature of Each Smog**:
- **Classical Smog**: Contains reducing agents. The presence of sulfur dioxide and particulate matter indicates that it can reduce other substances.
- **Photochemical Smog**: Contains oxidizing agents. The formation of ozone and other reactive species indicates that it can oxidize other substances.

3. **Analyze the Options**:
- **Option A**: Classical smog is reducing, and photochemical smog is oxidizing.
- **Option B**: Classical smog is oxidizing, and photochemical smog is reducing.
- **Option C**: Both are oxidizing smogs.
- **Option D**: Both are reducing smogs.

4. **Match the Statements to the Definitions**:
- From our understanding:
- Classical smog (I) is indeed a reducing mixture.
- Photochemical smog (II) is an oxidizing mixture.
- Therefore, the correct option is **Option A**.

5. **Conclusion**:
- The correct statement is that classical smog is a reducing mixture (I) and photochemical smog is an oxidizing mixture (II).

### Final Answer:
The correct answer is **Option A**: Classical smog is reducing, and photochemical smog is oxidizing.