Question

During depression of freezing point in a solution the following are in equilibrium

• A. liquid solvent, solid solvent
• B. liquid solvent, solid solute
• C. liquid solute, solid solute
• D. liquid solute, solid solvent

Answer 1

Answer: (A)

liquid solvent, solid solvent

Answer 2

The correct answer is Option A) liquid solvent, solid solvent

Freezing point depression in a solution occurs when the liquid solventand solid solvent are in equilibrium. During the freezing of a solution, only the solvent freezes out while the equilibrium exists between the solid and liquid forms of the solvent.

• For the system to be at equilibrium, the vapor pressure of the solid and liquid forms of the solvent must be the same at the freezing point.
• The lowering of the vapor pressure causes a decrease in the temperature at which the vapor pressures of the liquid and frozen forms of the solution become equal.

Therefore, Option A is the correct answer.

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