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What is the freezing point of a solution...

What is the freezing point of a solution containing `8.1g Br `in `100g` water assuming the acid to be `90%`ionised(`K_(f)`for water =`1.8K "mole"^(-1))`

A

`0.85^(@)C`

B

`-3.53^(@)C`

C

`0^(@)C`

D

`-0.35^(@)C`

Text Solution

Verified by Experts

The correct Answer is:
B
`underset((1-alpha))(HBr)hArr underset(alpha)(H^(+))+underset(alpha)(Br^(-))`
Total `=1+alpha:.i=1+alpha=1+0.9=1.9`
`DeltaT_(f)=iK_(f)xxm=1.9xx1.86xx(8.1)/(81)xx(1000)/(100)=3.53^(@)C`
`T_(f)=-3.53^(@)C`
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