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0.5 molal aqueous solution of a weak aci...

0.5 molal aqueous solution of a weak acid (HX) is 20% ionised. If `K_(f)` for water is `1.86K kg mol^(-1)`, the lowering in freezing point of the solution is

A

`-1.12 K`

B

0.56 K

C

1.12 K

D

`0.56 K`

Text Solution

Verified by Experts

The correct Answer is:
C
`alpha=(i-1)/(n-1)rArr 0.2=(i-1)/(2-1)rArr i=1.2`
`rArr Delta T=ixxK_(f)xx m`
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