The factors responsible for the stability of lyophilic sols are

Options

A. Charge and solvation of colloidal particles
B. Large particle size only
C. Electrical charge only
D. Brownian movement and larger size

Answer

### Step-by-Step Solution:

1. **Understanding Lyophilic Sols**:
- Lyophilic sols are colloidal systems where the dispersed phase has a strong affinity for the dispersion medium. They are formed by directly mixing substances in a suitable dispersive medium.

2. **Characteristics of Lyophilic Sols**:
- These sols are stable due to strong interactions between the dispersed phase and the dispersion medium. They are also known as reversible sols because the dispersion medium can be isolated without losing the colloidal properties.

3. **Factors Affecting Stability**:
- The stability of lyophilic sols primarily depends on two factors:
- **Charge of Colloidal Particles**: The electrical charge on the colloidal particles helps to prevent them from aggregating.
- **Solvation of Colloidal Particles**: The presence of a solvent layer around the colloidal particles enhances stability by preventing coagulation.

4. **Role of Electrolytes and Solvents**:
- The addition of electrolytes or suitable solvents can enhance the stability of lyophilic sols by promoting solvation and maintaining the charge on the particles.

5. **Conclusion**:
- The correct answer to the question regarding the factors responsible for the stability of lyophilic sols is:
- **Charge and solvation of colloidal particles**.

### Final Answer:
The factors responsible for the stability of lyophilic sols are **charge and solvation of colloidal particles**.

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