The formation of a colloidal from suspension is

Options

A. peptisation
B. condenstion
C. sedimentation
D. fragmentation

Answer

To solve the question regarding the formation of a colloid from a suspension, we need to analyze the options provided and understand the processes involved in colloidal formation.

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Suspension**: A mixture in which particles are dispersed throughout a liquid or gas but are not dissolved. The particles in a suspension are usually larger than those in a colloid.
- **Colloid**: A mixture where very small particles of one substance are dispersed in another substance. The particle size in a colloid is smaller than that in a suspension.

2. **Identifying the Process**:
- To convert a suspension into a colloid, we need to reduce the size of the larger particles found in the suspension. This process involves breaking down the larger particles into smaller ones.

3. **Evaluating the Options**:
- **Option 1: Peptization** - This process involves the conversion of a precipitate into a colloidal solution by the addition of a dispersing agent. It is not the correct answer for converting a suspension into a colloid.
- **Option 2: Condensation** - This refers to the process where smaller particles combine to form larger particles. This does not apply to our situation.
- **Option 3: Sedimentation** - This is the process where suspended particles settle down under the influence of gravity. This does not lead to the formation of a colloid.
- **Option 4: Fragmentation** - This is the process of breaking down larger particles into smaller ones, which is exactly what we need to do to form a colloid from a suspension.

4. **Conclusion**:
- The correct answer is **Option 4: Fragmentation**. This process allows the larger particles in a suspension to be broken down into smaller particles, resulting in the formation of a colloidal solution.

### Final Answer:
The formation of a colloid from a suspension is **Fragmentation**.