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The freezing point (in .^(@)C) of a solu...

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

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
`K_(3)[Fe(CN)_(6)]rarr3K^(+)+[Fe(CN)_(6)]^(3-)`
`i=4`
`DeltaT=ixxK_(f)xx(w_(B)xx1000)/(m_(B)xxw_(A))=4xx1.86xx(0.1xx1000)/(329xx100)`
`=2.3xx10^(-2)`
`:.` Freezing point of solution will be `-2.3 xx 10^(-2) .^(@)C`]
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The freezing point (in .^@C ) of solution containing 0.1 g of K_(3)[Fe(CN)_(6)] (molecular weight 329) in 100 g of water (K_(f) = 1.86 K kg mol^(-1)) is

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