Wltich or the roilowing expressions correctlY represents the equivalent conductance at infinite dilution of `Al_(2)(SO_(4))_(3),` Given that `^^_(Al^(3+))^(@)and ^^_(SO_(4)^(2-))^(@)` are the equivalent conductances at infinite dilution of the respective ions?

Options

A. `1/3 ^^_(Al^(3+))^(@)+1/2^^_(SO_(4)^(2-))^(@)`
B. `2^^_(Al^(3+))^(@)+3^^_(SO_(4)^(2-))^(@)`
C. `^^_(Al^(3+))^(@) +^^_(SO_(4)^(2-))^(@)`
D. `(^^_(Al^(3))^(@) + ^^_(SO_(4)^(2-))^(@))xx6`

Answer

C

Explanation

Conductivity of an electrolyte depends on the mobility of ions and concentration of ions. The motion of an ionic species in an electric field is retarded by the oppositely charged ions due to their interionic attraction. On dilution, concentration of electrolyte decreases and the retarding influence of oppositely charged ions decreases. Therefore mobility of ions increases.