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The molal depression constant for water ...

The molal depression constant for water is `1.86^(@)C`. The freezing point of a `0.05-molal` solution of a non-electrolyte in water is

A

`-1.86^(@)C`

B

`-0.93^(@)C`

C

`-0.093^(@)C`

D

`0.93^(@)C`

Text Solution

Verified by Experts

The correct Answer is:
C
`Delta T_(f)=K_(f)xx` molality `=1.86xx0.05=0.093^(@)C`
Thus freezing point `=0-0.093=-0.093^(@)C`.
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Knowledge Check

  • The freezing point of a 0.05 molal solution of a non-electrolyte in water is [K_(f)=1.86K//m]

    A
    `-1.86^(@)C`
    B
    `-0.93^(@)C`
    C
    `-0.093^(@)C`
    D
    `0.93^(@)C`

  • The freezing point of a 0.05 molal solution of a non-electrolyte in water is: ( K_(f) = 1.86 "molality"^(-1) )

    A
    (a) `-1.86^(@)C`
    B
    (b) `-0.93^(@)C`
    C
    (c ) `-0.093^(@)C`
    D
    (d) `0.093^(@)C`

  • The molal depression constant for a solvent is 4.9. The depression in freezing point for a millimolal solution of a non-electrolyte in the solvent is

    A
    0.49
    B
    4.9
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    4.9 + 0.001
    D
    0.0049.

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