Question

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. `-2.3xx10^(-2)`
B. `-5.7xx10^(-2)`
C. `-5.7xx10^(-3)`
D. `-1.2xx10^(-2)`

Answer 1

Correct Answer - A
`Delta T_(f)=ixx K_(f)xx m`
`=4xx1.86xx(0.1)/(329xx0.1)=2.3xx10^(-2)`
`rArr T_(f)=0-2.3xx10^(-2)=-2.3xx10^(-2) .^(@)C`.
`rArr V = 6 mL`.