Question

The molar ionic conductances at infinte dilution of `Mg^(2+)` and `Cl^(-)` are 106.1 and `76.3 ohm^(-1) cm^(2)` solution of `MgCl_(2)` at infinite dilution will be
A. `29.8 ohm^(-1) cm^(2) mol^(-1)`
B. `183.4 ohm^(-1) cm^(2) mol^(-1)`
C. `285. 7 ohm^(-1) cm^(2) mol^(-1)`
D. `258.7 ohm^(-1) cm^(2) mol^(-1)`

Answer 1

Correct Answer - A
`Lambda_(MgCl_(2))^(@) = lambda_(Mg^(2+))^(@) + 2 lambda_(Cl^(-))^(@)`
`=106.1 + 2 xx 76.3`
`= 258.7 Omega^(-1) cm^(2) mol^(-1)`