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

Options

A. Photochemical smog is formed through photochemical reaction involving solar energy
B. Photochemical smog does not cause irritation in eyes and throat
C. Carbon monoxide does not play any role in photochemical smog formation
D. Photochemical smog is an oxidising agent in character

Answer

To determine which statement regarding photochemical smog is not correct, we need to analyze the characteristics and effects of photochemical smog. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand Photochemical Smog
Photochemical smog is a type of air pollution that occurs when sunlight reacts with pollutants such as nitrogen oxides and volatile organic compounds in the atmosphere. This reaction produces a mixture of harmful chemicals, including ozone.

**Hint:** Remember that photochemical smog is primarily formed through reactions involving sunlight and specific pollutants.

### Step 2: Identify the Components
The major components of photochemical smog include nitrogen oxides (NOx), ozone (O3), and peroxyacetyl nitrate (PAN). These components are formed through various photochemical reactions.

**Hint:** Focus on the key components that contribute to the formation of photochemical smog.

### Step 3: Effects of Photochemical Smog
Photochemical smog can cause various health issues, including respiratory problems and irritation of the eyes and throat. This is due to the presence of ozone and other irritants in the smog.

**Hint:** Consider how photochemical smog affects human health and the environment.

### Step 4: Analyze the Statements
Now, let’s evaluate the statements provided in the question:

1. **Statement 1:** Photochemical smog forms due to photochemical reactions involving solar energy.
- This statement is **correct** because photochemical smog is indeed formed through reactions that require sunlight.

2. **Statement 2:** Photochemical smog does not cause irritation to the eyes and throat.
- This statement is **not correct** because photochemical smog is known to cause irritation to the eyes and throat.

3. **Statement 3:** Carbon monoxide does not play any important role in photochemical smog.
- This statement is **correct** as nitrogen oxides play a more significant role in the formation of photochemical smog than carbon monoxide.

4. **Statement 4:** Photochemical smog acts as an oxidizing agent.
- This statement is also **correct** since photochemical smog can oxidize other substances, including ozone.

### Step 5: Conclusion
Based on the analysis, the statement that is **not correct** is **Statement 2**, which claims that photochemical smog does not cause irritation to the eyes and throat.

**Final Answer:** The statement regarding photochemical smog that is not correct is **Statement 2**.

---