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A solution of urea (molar mass 56) boils...

A solution of urea (molar mass 56) boils at `100.18^@C` at atmospheric pressure. If `K_f` and `K_g` for water are 1.86 and 0.512 K `"molality"^(-1)` respectively, the above solution will freeze at

A

`-6.54^@C`

B

`6.54^@C`

C

`-0.654^@C`

D

`0.654^@C`

Text Solution

Verified by Experts

The correct Answer is:
C
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Knowledge Check

  • An aqueous solution freezes at - 0.372^@C . If K_f and K_b for water are 1.86K kg "mol"^(-1) and 0.53 K kg "mol"^(-1) respectively, the elevation in boiling point of same solution in K is:

    A
    0.72
    B
    0.46
    C
    4.6
    D
    0.106

  • Molality of an aqueous solution that produces an elevation of boiling point of 1.00K at 1 atm pressure. ( K_b for water 0.512 K. kg. "mol"^(-1) )

    A
    0.512 M
    B
    0.195 m
    C
    1.95 m
    D
    5.12 M

  • A Solution of a non-volatile solute in water freezes at -0.30^@C . The vapour-pressure of pure water at 298K is 23.51 mm Hg and K_f for water is 1.86 K. kg "mol"^(-1) Calculate the vapour-pressure of this solution at 298K.

    A
    23.4 mm
    B
    24.8 mm
    C
    34.8 mm
    D
    40 mm

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