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An aqueous solution freezes at 272.4 K w...

An aqueous solution freezes at 272.4 K while pure water freezes at 273 K. Given `K_(f)=1.86 K kg "mol"^(-1)`,`K_(b)=0.512 K kg "mol"^(-1)` and vapour pressure of water at 298 K = 23.756 mm Hg. Determine the following.
Molality of the solution is

A

freezing point of solution `= - 3.72^(@)C`

B

boiling point of soution `= 100.512^(@)C`

C

osmotic pressure `= 3.76` atm

D

observed molecular mass = 37.25 (approx.assuming degree of dissociation = 1).

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The correct Answer is:
B, D
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