i) State Kohlrausch law.
ii) What is meant by limiting molar conductance.

Explanation

`E_("cell") = E_(Cu^(2+)//Cu^(-))^(0) - E_(Mg^(3+)//mg)^(0) (RT)/(2F) "log"_(10)([Mg^(2+)])/([Cu^(2+)])`
`E_("cell") = (0.34 - (2.37)) - (0.059)/(2) "log"_(10)(10^(-3))/(10^(-4))`
`E_("cell") = 2.71 - (0.059)/2 "log"_(10)10`
`E_("cell") = 2.68 V`.
(b) (i) Limiting molar conductivity of an electrolyte can be represented as the sum of the individual contributions of the anion and cation of the electrolyte. (ii) When concentration approaches zero, the molar conductance is known as limiting molar conductance.