Colloidal system shows extensive adsorption due to large …………….

Answer

To solve the question, "Colloidal system shows extensive adsorption due to large …………….", we need to fill in the blank with the appropriate term that explains why colloidal systems exhibit extensive adsorption.

### Step-by-Step Solution:

1. **Understanding Colloidal Systems**:
- Colloidal systems consist of particles that range in size from 1 nanometer to 1000 nanometers. These particles are dispersed in a continuous medium and can exhibit unique properties due to their size.

2. **Defining Adsorption**:
- Adsorption is the process where molecules of a substance (adsorbate) accumulate on the surface of another substance (adsorbent). This is a surface phenomenon, meaning it primarily occurs at the interface between the adsorbate and the adsorbent.

3. **Role of Surface Area**:
- The extent of adsorption is significantly influenced by the surface area of the adsorbent. A larger surface area allows for more adsorption sites, leading to increased adsorption capacity.

4. **Properties of Colloidal Particles**:
- Colloidal particles have a relatively large surface area compared to their volume. This is due to their small size and the fact that they are dispersed in a medium, which maximizes the area available for adsorption.

5. **Conclusion**:
- Since colloidal particles possess a large surface area, they are capable of extensive adsorption. Therefore, the blank can be filled with "surface area".

### Final Answer:
Colloidal system shows extensive adsorption due to large **surface area**.