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If mole fraction of the solvent in a sol...

If mole fraction of the solvent in a solution decreases than:

A

vapour pressure of solution increases

B

b.pt decreases

C

osmotic pressure increases

D

all are correct

Text Solution

Verified by Experts

The correct Answer is:
C
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Define mole fraction of a substance in a solution

If p^(0) and P_(S) are the vapour pressures of the solvent and solution respectively, n_(1) and n_(2) are the mole fractions of the solvent and solute respectively, then

Knowledge Check

  • If P^(@) and P_(S) are the vapour pressure of the solvent and solution respectively, n_(1) and n_(2) are the mole fractions of the solvent and solute respectively, then:

    A
    `P_(S)=P^(@)n_(1)`
    B
    `P_(S)-P^(@)n_(2)`
    C
    `P^(@)=P_(S)n_(2)`
    D
    `P_(S)=P^(@)(n_(1)//n_(2))`

  • If P^(@) and P_(5) are the vapour pressure of the solvent and its solution respectively and x_(1) and x_(2) are the mole fraction of the solvent and solute respectively, then

    A
    `P_(s) = P^(@) 2x_(2)`
    B
    `P^(@) - P_(s) = P^(@)x_(2)`
    C
    `P_(s) = P^(@)x_(1)`
    D
    `(P^(@)-P_(s))//P_(s)=x_(1)//(x_(1)+x_(2))`

  • The vapour pressure of a solvent decreased by 10 mmHg when a nonvolatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What would be the mole fraction of the solvent if the decrease in the vapour pressure is to be 20 mmHg?

    A
    0.8
    B
    0.6
    C
    0.4
    D
    0.2

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    The mole fraction of a solvent in a solution is 0.8 . The mole fraction of the solute will be _____.

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