The potential differnce between the fixed particles layer and the diffused layer having opposite charge id called :

Options

A. Zeta potential
B. Beta potential
C. Alpha potential
D. Gamma potential

Answer

To solve the question regarding the potential difference between the fixed particles layer and the diffused layer having opposite charge, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Layers**:
- In a colloidal system, there are two important layers: the fixed layer and the diffused layer. The fixed layer consists of particles that are firmly attached to the surface of the colloidal particles, while the diffused layer contains ions that are attracted to the fixed layer due to electrostatic forces.

2. **Identifying Charges**:
- The fixed layer usually has a specific charge (for example, negatively charged in the case of a negatively charged colloid), and the diffused layer will have an opposite charge (positively charged in this example). This setup creates a potential difference between the two layers.

3. **Defining the Potential Difference**:
- The potential difference that arises between the fixed layer and the diffused layer due to their opposite charges is a crucial concept in colloidal chemistry.

4. **Naming the Potential Difference**:
- The potential difference between these two layers is known as the **zeta potential**. It is also referred to as the **electrokinetic potential**.

5. **Conclusion**:
- Therefore, the answer to the question is that the potential difference between the fixed particles layer and the diffused layer having opposite charge is called the **zeta potential** or **electrokinetic potential**.

### Final Answer:
The potential difference between the fixed particles layer and the diffused layer having opposite charge is called the **zeta potential** or **electrokinetic potential**.