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In the depression of freezing point expe...

In the depression of freezing point experimet, it is found that:
I. The vapour pressure of the solution is less than that of pure solvent.
II. The vapour pressure of the solution is more than that of pure solvent.
III. Only solute molecules solidify at the freezing point.
IV. Only solvent molecules solidify at the freezing point.

A

I,II

B

II,III

C

I,IV

D

I,II,III.

Text Solution

Verified by Experts

The correct Answer is:
C
The freezing point of a solvent depresses as a non-volatile solute is added to a solvent. According to Raoult's law, when a non-volatile solute is added to a solvent the vapour pressure of the solvent decreases. At freezing point it will be only the solvent molecules which will solidify.
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Knowledge Check

  • In the depression of freezing point experiment , it is found that : (P) the vapour pressure of the solution is less than that of pure solvent . (Q) the vapour pressure of the solution is more than that of pure solvent . (R) only solute molecules solidify at the freezing point . (S) only solvent molecules solidify at the freezing point .

    A
    P,Q
    B
    Q,R
    C
    P,S
    D
    P,Q,R

  • The depression in freezing point is maximum if the solvent used is

    A
    Camphor
    B
    Naphthalene
    C
    Benzene
    D
    Water

  • The vapour pressure of a dilute solution of non-volatile solute is P and the VP of a pure solvent is P^@ . The lowering of the VP is

    A
    `+ve`
    B
    `-ve`
    C
    `P//P^@`
    D
    `P^@//P`

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