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In a 2.0 molal aqueus solution of a weak...

In a 2.0 molal aqueus solution of a weak acid HX the degree of disssociation is 0.25. The freezing point of the solution will be nearest to: (`K_(f)=1.86 K kg "mol"^(-1)`)

A

`-026^@C`

B

`0.465^@C`

C

`-0.48^@C`

D

`-0.465^@C`

Text Solution

Verified by Experts

The correct Answer is:
D
`i=1 + alpha rArr 1.25`
`DeltaT_f = K_f.m.i rArr 1.86 xx 0.2 xx 1.25`
or `DeltaT_f = 0.465 or T_f = -0.465^@C`
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