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One or More than One Options Correct Type
This section contains 2 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.
Q.
In the depression of freezing point experiment, it is found that the
  • 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 poin
  • d)
     only solvent molecules solidify at the freezing point
Correct answer is option 'A,D'. Can you explain this answer?
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One or More than One Options Correct TypeThis section contains 2 multi...
(a, d) Liquid solvent   Solid solvent
Freezing point is the temperature at which liquid solvent and solid remain at equilibrium . In the following figure ,
On adding solute to solvent, vapour pressure falls p1 < p0 and T1<T0
Thus, (a) is correct.
Only solvent molecules solidify at the freezing point.
Thus, (d) is also correct.
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One or More than One Options Correct TypeThis section contains 2 multi...
Depression of Freezing Point Experiment

In the depression of freezing point experiment, a solution is prepared by dissolving a solute in a solvent. The objective of this experiment is to measure the decrease in freezing point of the solvent caused by the presence of the solute.

Vapour Pressure of the Solution

The first statement states that the vapour pressure of the solution is less than that of the pure solvent. This statement is correct. When a solute is added to a solvent, the solute particles occupy some of the space between the solvent particles. This reduces the number of solvent particles available at the surface of the solution, leading to a decrease in the vapour pressure. Therefore, the vapour pressure of the solution is lower than that of the pure solvent.

Only Solute Molecules Solidify at the Freezing Point

The third statement states that only solute molecules solidify at the freezing point. This statement is incorrect. In a solution, both the solvent and solute molecules are present. When the temperature of the solution is lowered, the solvent molecules start to slow down and form a solid lattice at the freezing point. However, the presence of the solute disrupts the formation of this lattice and prevents the solvent molecules from solidifying. Therefore, it is incorrect to say that only solute molecules solidify at the freezing point.

Only Solvent Molecules Solidify at the Freezing Point

The fourth statement states that only solvent molecules solidify at the freezing point. This statement is correct. As mentioned earlier, when the temperature of the solution is lowered, the solvent molecules slow down and form a solid lattice at the freezing point. The solute particles do not participate in the solidification process and remain in the solution. Therefore, it is correct to say that only solvent molecules solidify at the freezing point.

Summary

To summarize, in the depression of freezing point experiment, the vapour pressure of the solution is lower than that of the pure solvent. Both the solvent and solute molecules are present in the solution, but only solvent molecules solidify at the freezing point. Therefore, the correct statements are option A (vapour pressure of the solution is less than that of pure solvent) and option D (only solvent molecules solidify at the freezing point).
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One or More than One Options Correct TypeThis section contains 2 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.Q.In the depression of freezing point experiment, it is found that thea)vapour pressure of the solution is less than that of pure solventb)vapour pressure of the solution is more than that of pure solventc)only solute molecules solidify at the freezing poind)only solvent molecules solidify at the freezing pointCorrect answer is option 'A,D'. Can you explain this answer?
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One or More than One Options Correct TypeThis section contains 2 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.Q.In the depression of freezing point experiment, it is found that thea)vapour pressure of the solution is less than that of pure solventb)vapour pressure of the solution is more than that of pure solventc)only solute molecules solidify at the freezing poind)only solvent molecules solidify at the freezing pointCorrect answer is option 'A,D'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about One or More than One Options Correct TypeThis section contains 2 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.Q.In the depression of freezing point experiment, it is found that thea)vapour pressure of the solution is less than that of pure solventb)vapour pressure of the solution is more than that of pure solventc)only solute molecules solidify at the freezing poind)only solvent molecules solidify at the freezing pointCorrect answer is option 'A,D'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for One or More than One Options Correct TypeThis section contains 2 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.Q.In the depression of freezing point experiment, it is found that thea)vapour pressure of the solution is less than that of pure solventb)vapour pressure of the solution is more than that of pure solventc)only solute molecules solidify at the freezing poind)only solvent molecules solidify at the freezing pointCorrect answer is option 'A,D'. Can you explain this answer?.
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