Cloud is an example of:

Options

A. Solid dispersed in gas
B. Liquid dispersed in gas
C. Liquid dispersed in solid
D. Solid dispersed in liquid

Explanation

To determine what a cloud is an example of, we need to understand the concept of colloids and the different types of colloids based on the phases of the dispersed particles and the dispersion medium.

### Step-by-Step Solution:

1. **Define Colloid**:
A colloid is a mixture where very small particles (ranging from 1 to 1000 nanometers) of one substance are evenly distributed within another substance.

2. **Identify Phases**:
Colloids can be classified based on the state of the dispersed phase (solute) and the dispersion medium (solvent). The possible combinations are:
- Solid in gas
- Liquid in gas
- Liquid in solid
- Solid in liquid

3. **Examples of Colloids**:
- **Solid in Gas**: This type of colloid is called smoke. An example is dust particles suspended in air.
- **Liquid in Gas**: This type of colloid is known as an aerosol. Examples include clouds, fog, and mist.
- **Liquid in Solid**: This is referred to as a gel. Examples include butter, cheese, and jellies.
- **Solid in Liquid**: This is called a sol. Examples include paints and emulsions.

4. **Identify the Type of Cloud**:
Since clouds consist of tiny water droplets or ice crystals suspended in the air, they fall under the category of "liquid in gas," which is classified as an aerosol.

5. **Conclusion**:
Therefore, a cloud is an example of an aerosol, which is a type of colloid.

### Final Answer:
Cloud is an example of an aerosol (liquid in gas).

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