The ionic mobilities of the cation and the aniom of a salt `A_(2)`B are 140 and 80 `ohm^(-1)cm^(2)eq^(-1)` respectively. The equivlent conductivity of salt at infinite dilution is (in `ohm^(-1)cm^(2)eq^(-1)`):

Options

A. `160ohm^(-1)cm^(2)eq^(-1)`
B. `220ohm^(-1)cm^(2)eq^(-1)`
C. `60ohm^(-1)cm^(2)eq^(-1)`
D. `360ohm^(-1)cm^2eq^(-1)`

Explanation

(B) `A_(eq)^(oo)(A_2B)=lamda_(eq)^(oo)(A^+)+lamda_(eq)^(oo)(B^(2-))`
`=140+80=220ohm^(-1)cm^2eq^(-1)`