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

The freezing point (in `.^(@)C)` of a solution containing `0.1 g` 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
`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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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 :

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