1.

The unit of ebillioscopic constant isA. K kg `mol^(-1) or ("molality")^(-1)`B. mol kg `K^(-1)or K^(-1)("molality")`C. kg `mol^(-1)K^(-1)or K^(-1)("molality")^(-1)`D. K `mol kg^(-1)or K ("molality")`

Answer» Correct Answer - A
As we know from elevation in boiling point that
`DeltaT_(b)K_(b)m`
`K_(b)=(DeltaT_(b))/(m)`
Unit of `K_(b)=("unit of "DeltaT_(b))/("unit of"m)=(K)/("molality")`
`=(K)/(molkg^(1))=Kmol^(-1)kg`


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