Fog is a colloidal system of :-

Options

A. liquid in gas
B. gas in liquid
C. solid in gas
D. gas in solid

Answer

To determine the nature of fog as a colloidal system, we need to analyze the components of fog and how they fit into the definitions of colloidal systems.

### Step-by-Step Solution:

1. **Understanding Colloidal Systems**:
- A colloidal system consists of two phases: the dispersed phase and the dispersion medium. The dispersed phase is the substance that is distributed throughout another substance (the dispersion medium).

2. **Identifying the Components of Fog**:
- Fog is essentially made up of tiny water droplets suspended in the air. Here, the water droplets are the dispersed phase, and the air acts as the dispersion medium.

3. **Classifying the Colloidal System**:
- Given that the dispersed phase (water droplets) is a liquid and the dispersion medium (air) is a gas, we can classify fog as a colloidal system of liquid in gas.

4. **Conclusion**:
- Based on this classification, we conclude that fog is a colloidal system of liquid in gas.

### Final Answer:
Fog is a colloidal system of **liquid in gas**.