Photochemical smog is a mixture of oxidising pollutants.(T/F)

Answer

To determine whether the statement "Photochemical smog is a mixture of oxidising pollutants" is true or false, let's analyze the components of photochemical smog step by step.

### Step-by-Step Solution:

1. **Definition of 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 (VOCs).

**Hint**: Remember that photochemical smog is formed in the presence of sunlight and specific pollutants.

2. **Components of Photochemical Smog**:
- **Nitrogen Oxides (NOx)**: These are produced from vehicle emissions and industrial processes. Nitric oxide (NO) is a significant component.
- **Unburnt Hydrocarbons**: These are organic compounds that have not been fully combusted. They are also known as volatile organic compounds (VOCs).

**Hint**: Identify the main pollutants involved in the formation of photochemical smog.

3. **Nature of Pollutants**:
- Both nitrogen oxides and unburnt hydrocarbons can act as oxidizing agents.
- They participate in photochemical reactions that lead to the formation of secondary pollutants like ozone (O3), which is a strong oxidizing agent.

**Hint**: Consider how these pollutants interact with sunlight and each other to form more complex compounds.

4. **Conclusion**:
Since photochemical smog consists of nitrogen oxides and unburnt hydrocarbons, which are indeed oxidizing pollutants, we can conclude that the statement is true.

**Final Answer**: The statement "Photochemical smog is a mixture of oxidising pollutants" is **True**.

### Summary:
Photochemical smog is formed from a mixture of nitrogen oxides and unburnt hydrocarbons, both of which are oxidizing pollutants. Therefore, the statement is true.

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