At freezing point of a solution there is always

Options

A. An equilibrium solution (I)` hArr `solution (I)
B. Vapour pressure of solution (I) = solvent (s)
C. An equilibrium solvent (I)` hArr` solvent (s)
D. Both (2) & (3)

Answer

To solve the question, "At freezing point of a solution there is always," we will analyze the options provided and the principles of freezing point depression.

### Step-by-Step Solution:

1. **Understanding Freezing Point Depression**:
- When a non-volatile solute is added to a pure solvent, the freezing point of the solution decreases compared to that of the pure solvent. This phenomenon is known as freezing point depression.

2. **Establishing Equilibrium**:
- At the freezing point of a solution, the liquid solvent is in equilibrium with its solid form. This means that some of the liquid solvent is freezing to form solid solvent, while some of the solid solvent is melting back into the liquid state.

3. **Vapor Pressure Consideration**:
- The vapor pressure of the solution (liquid phase) is less than that of the pure solvent due to the presence of the non-volatile solute. However, at the freezing point, the vapor pressure of the liquid solvent is equal to the vapor pressure of the solid solvent.

4. **Analyzing the Options**:
- **Option 1**: "Equilibrium solution liquid to solution liquid" - This is incorrect because we are not dealing with two solutions at equilibrium.
- **Option 2**: "Vapor pressure of solution liquid is equal to solvent solid" - This is correct because at the freezing point, the vapor pressures are equal.
- **Option 3**: "Equilibrium solvent liquid to solvent solid" - This is also correct as the liquid solvent is in equilibrium with the solid solvent.

5. **Conclusion**:
- Since options 2 and 3 are correct, the answer to the question is that at the freezing point of a solution, there is always an equilibrium between the liquid solvent and the solid solvent, and the vapor pressure of the solution liquid is equal to that of the solid solvent.

### Final Answer:
**The correct answer is D: Both 2 and 3 are correct.**

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