Elevation in boiling point of an aqueous solution of a non-electroluyte solute is `2.01^(@)` . What is the depression in freezing point of the solution ?
`K_(b)(H_(2)O)=0.52^(@)mol^(-1)kg`
`K_(f)(H_(2)O)=1.86^(@)mol^(-1)kg`

Options

A. `7.17^(@)`
B. `0.52^(@)`
C. `3.57^(@)`
D. `0.93^(@)`

Answer

A

Explanation

`DeltaT_(b)` = Molarity `xx K_(b)`
`DeltaT=mK_(b)`
`DeltaT_(f)=mK_(f)`
`:. (cancelOT_(f))/(cancelOT_(b))=(K_(f))/(K_(b))=(1.86)/(0.52)=3.57`