The unit of ebulioscopic constant is …….

Options

A. K kg `mol^(-1)` or K `("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

A

Explanation

`Delta T_(b)=K_(b).m`
`K_(b)=(Delta T_(b))/(m)=(K)/("Molality")=(K)/(mol kh^(-1))="K kg mol"^(-1)`.