Answer :
In thermodynamics, Ebullioscopic constant relates molality to the boiling point elevation.
This relation is
Where 
is the elevation in the boiling point, i is the van’t Hoff factor, b is the molality and Kb is the Ebullioscopic constant.
Thus, the unit of an ebullioscopic constant is K (molality)-1 or K Kg mol-1, as molality= 
.
Thus, Option (i) is the correct answer.
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