1.

If the elevation in boiling point of a solution of non-volatile, non-electrolyticand non-associating solute in a solvent ( K_(b)=x "K kg mol"^(-1) ) is y K, then the depression in freezing point of the same concentration would be ( K_(f) of the solvent = z "K kg mol"^(-1))

Answer»

`(2 X z)/(y)`
`(YZ)/(2)`
`(xz)/(y)`
`(xz)/(2y)`

Solution :`DeltaT_(b)=K_(b)xxm` or `y=x XX m` ...(i)
`DeltaT_(f)=K_(f)xxm` or `DeltaT_(f)=z xx m`(ii)
Since m is same, DIVIDING eq. (ii) by eq. (i)
`(DeltaT_(f))/(y)=z/x` or `Delta_(f)=(yz)/(x)`


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