Which of the following statements is correct for a lyophilic sol?

Options

A. It is not easily solvated
B. The coagulation of this sol is irreversible in nature
C. It is unstable
D. It is quite stable in a solvent

Answer

To determine the correct statement about lyophilic sols, let's analyze their characteristics step by step.

### Step 1: Definition of Lyophilic Sols
Lyophilic sols are colloidal systems where the dispersed phase (the solute) has a strong affinity for the dispersion medium (the solvent). This means that the particles of the dispersed phase are well-solvated by the solvent molecules.

**Hint:** Remember that "lyophilic" means "solvent-loving," indicating a strong interaction between the solute and solvent.

### Step 2: Stability of Lyophilic Sols
Lyophilic sols are generally stable. They do not easily coagulate or precipitate out of the solution. This stability is due to the strong interactions between the dispersed phase and the dispersion medium.

**Hint:** Consider how the interactions between particles affect the overall stability of the sol.

### Step 3: Coagulation of Lyophilic Sols
When discussing coagulation, it's important to note that for lyophilic sols, the coagulation process is reversible. This means that if a lyophilic sol is coagulated, it can be redispersed back into the sol state.

**Hint:** Think about the reversibility of processes in chemistry and how it applies to colloidal systems.

### Step 4: Evaluating the Options
Now, let's evaluate the given options based on our understanding:

1. **Not easily solvated** - This is incorrect; lyophilic sols are easily solvated.
2. **Coagulation is irreversible** - This is incorrect; coagulation is reversible for lyophilic sols.
3. **Unstable** - This is incorrect; lyophilic sols are stable.
4. **Quite stable in the solvent** - This is correct; lyophilic sols are indeed stable in the solvent.

### Conclusion
The correct statement about lyophilic sols is option number 4: "It is quite stable in the solvent."

**Final Answer:** Option 4