Molar ionic conductivites of a bivalent electrolyte are 57 and 73. the molar conductivity of the solution will be

Options

A. `130 S cm^(2) mol^(-1)`
B. `65 S cm^(2) mol^(-1)`
C. `260 S cm^(2) mol^(-1)`
D. `187 S cm^(2) mol^(-1)`

Answer

A

Explanation

According to kohlrausch law of independent migration of ions, the molar conductivity of an electrolyte at infinite dilution is equal to the sum of the contributions of the molar conductivities of its ions. Hence,
`Lamda_(AB)= lamda_(A)^(2+) + lamda_(B)^(2-)`
`=57+73`
`=130S cm^(2) mol^(-1)`