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The freezing point (.^(@)C) of a solutio...

The freezing point `(.^(@)C)` of a solution containing `0.1 g` of `K_(3)[Fe(CN)_(6)]` (molecular weight 329) on `100 g` of water `(K_(f)=1.86 K kg mol^(-1))`

A

`-2.3 xx 10^(-2)`

B

`-5.7 xx 10^(-2)`

C

`-5.7 xx 10^(-3)`

D

`-1.2 xx 10^(-2)`

Text Solution

Verified by Experts

The correct Answer is:
A
`DeltaT_(f) = m xx K_(f) xx i`
`=(0.1//329)/(100) xx 1000 xx 1.86 xx 4 = 0.2261`
`= 2.3 xx 10^(-2)`
`T_(f) = 0 - DeltaT_(f) =- 2.3 xx 10^(2).^(@)C`
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