Fog is a colloid of solid in gas. True/False?

Answer

To determine whether the statement "Fog is a colloid of solid in gas" is true or false, we can analyze the components of fog and its classification in terms of colloids.

### Step-by-Step Solution:

1. **Definition of Fog**: Fog is a collection of tiny water droplets suspended in the air. It occurs when water vapor condenses into liquid droplets.

2. **Classification of Colloids**: Colloids can be classified based on the state of the dispersed phase and the dispersion medium. The main types are:
- Solid in liquid (e.g., paint)
- Liquid in solid (e.g., gel)
- Gas in liquid (e.g., whipped cream)
- Liquid in gas (e.g., fog, aerosol)
- Solid in gas (e.g., smoke)

3. **Analyzing the Composition of Fog**: In the case of fog, the dispersed phase is liquid (tiny water droplets), and the dispersion medium is gas (air). Therefore, fog is classified as a colloid of liquid in gas.

4. **Conclusion**: Since fog consists of liquid droplets (not solid particles) dispersed in a gas, the statement "Fog is a colloid of solid in gas" is false.

### Final Answer:
**False**