Question:
In the depression of freezing point experiment
A. Vapour pressure of the solution is less than that of pure solvent
B. Vapour pressure of the solution is more than that of pure solvent
C. Only solute molecules solidify at the freezing point
D. Only solvent molecules solidify at the freezing point
Choose the most appropriate answer from the options given below:
In the depression of freezing point experiment
A. Vapour pressure of the solution is less than that of pure solvent
B. Vapour pressure of the solution is more than that of pure solvent
C. Only solute molecules solidify at the freezing point
D. Only solvent molecules solidify at the freezing point
Choose the most appropriate answer from the options given below:
Updated On: Mar 21, 2025
- A only
- $B$ and $C$ only
- A and C only
- A and D only
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The Correct Option is D
Solution and Explanation
Statement A:
In a solution, the vapour pressure is reduced compared to the pure solvent due to the presence of solute particles, which lower the escaping tendency of solvent molecules.
Conclusion: True.
Statement B: Vapour pressure of the solution cannot be more than that of the pure solvent because solute particles always decrease vapour pressure.
Conclusion: False.
Statement C: At the freezing point, only solvent molecules solidify because solute molecules disrupt the crystalline structure of the solvent.
Conclusion: False.
Statement D: Only solvent molecules solidify at the freezing point due to the selective crystallization of the solvent.
Conclusion: True.
Final Conclusion: The correct statements are A and D.
Conclusion: True.
Statement B: Vapour pressure of the solution cannot be more than that of the pure solvent because solute particles always decrease vapour pressure.
Conclusion: False.
Statement C: At the freezing point, only solvent molecules solidify because solute molecules disrupt the crystalline structure of the solvent.
Conclusion: False.
Statement D: Only solvent molecules solidify at the freezing point due to the selective crystallization of the solvent.
Conclusion: True.
Final Conclusion: The correct statements are A and D.
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Concepts Used:
Solutions
A solution is a homogeneous mixture of two or more components in which the particle size is smaller than 1 nm.
For example, salt and sugar is a good illustration of a solution. A solution can be categorized into several components.
Types of Solutions:
The solutions can be classified into three types:
- Solid Solutions - In these solutions, the solvent is in a Solid-state.
- Liquid Solutions- In these solutions, the solvent is in a Liquid state.
- Gaseous Solutions - In these solutions, the solvent is in a Gaseous state.
On the basis of the amount of solute dissolved in a solvent, solutions are divided into the following types:
- Unsaturated Solution- A solution in which more solute can be dissolved without raising the temperature of the solution is known as an unsaturated solution.
- Saturated Solution- A solution in which no solute can be dissolved after reaching a certain amount of temperature is known as an unsaturated saturated solution.
- Supersaturated Solution- A solution that contains more solute than the maximum amount at a certain temperature is known as a supersaturated solution.