the stability of lyophilic colloids is due to

Options

A. charge on their particles
B. large size of their particles
C. small size of their particles
D. solvation by dispersion medium .

Answer

To determine the stability of lyophilic colloids, we need to analyze the options provided and understand the nature of lyophilic colloids.

### Step-by-Step Solution:

1. **Understanding Lyophilic Colloids**:
- Lyophilic colloids are colloidal systems that have a strong affinity for the dispersion medium (usually a liquid). The term "lyo" means liquid, and "philic" means loving, indicating that these colloids are "liquid-loving."

2. **Examples of Lyophilic Colloids**:
- Common examples include substances like proteins, starch, and gum. These substances readily dissolve in the dispersion medium and form stable colloidal solutions.

3. **Stability Factors**:
- The stability of lyophilic colloids is primarily due to the interactions between the colloidal particles and the dispersion medium.

4. **Solvation Process**:
- When a lyophilic colloid (like gum) is added to a dispersion medium (like water), the molecules of the dispersion medium surround the colloidal particles. This process is known as solvation or hydration.

5. **Attractive Forces**:
- The molecules of the dispersion medium exert strong attractive forces on the colloidal particles. This interaction prevents the particles from aggregating or precipitating out of the solution, thus maintaining stability.

6. **Conclusion**:
- The stability of lyophilic colloids is mainly due to solvation by the dispersion medium, which creates a stable environment for the colloidal particles.

### Final Answer:
The stability of lyophilic colloids is due to **solvation by the dispersion medium**.

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