Which of the following is correct about lyophilic sols?

Options

A. They are irreversible
B. They are formed by inorganic substances
C. They are readily coagulated by addition of electroylstes
D. They are self stabilized

Answer

To determine which statement is correct about lyophilic sols, we can analyze each option based on the properties of lyophilic sols.

### Step-by-Step Solution:

1. **Understanding Lyophilic Sols**:
- Lyophilic sols are known as "solvent-loving" sols. They have a strong affinity for the solvent and are typically formed by organic substances.

2. **Analyzing the Options**:
- **Option A**: "They are irreversible."
- This statement is incorrect. Lyophilic sols are reversible in nature. They can be converted back into their original state upon the removal of the solvent.

- **Option B**: "They are formed by inorganic substances."
- This statement is also incorrect. Lyophilic sols are primarily formed by organic substances, not inorganic ones.

- **Option C**: "They are readily coagulated by addition of electrolyte."
- This statement is incorrect. Lyophilic sols are not easily coagulated by electrolytes. They tend to remain stable even in the presence of electrolytes due to their self-stabilizing properties.

- **Option D**: "They are self-stabilized."
- This statement is correct. Lyophilic sols are indeed self-stabilized due to their reversible nature and the high degree of hydration of their particles. The particles in lyophilic sols carry a charge, which contributes to their stability.

3. **Conclusion**:
- After analyzing all the options, the correct statement about lyophilic sols is **Option D: They are self-stabilized.**

### Final Answer:
**The correct option is D: They are self-stabilized.**