The conductivity of 0.20 mol L^-1 solution of KCl is 2.48 x 10^-2 S cm^-1. Calculate its molar conductivity and degree of dissociation  (K⁺) = 73.56 S cm² mol^-1 and  (Cl^-)= 76.5 S

(b) What type of battery is mercury cell? Why is it more advantageous than dry cell?

Conductivity of KCl solution = 2.48 x 10^-2 S cm^-1

Concentration of KCl solution = 0.20 mol L^-1

                                                 = 0.20 x 1000 mol cm ^-3

                                                = 200 mol cm^-3

Molar conductivity 

b) Mercury cell is a type of primary battery. In primary batteries , the charging  reaction occurs only once and after it has been used over a period of time , the battery becomes dead and cannot be refused mercury cell is more advantage than dry cell has a very short life span due to the conversion of zinc to zinc chloride that makes the zinc casing porous . Due to this porous casing, the substance inside the cell leaks out and corrodes the metal, reducing the lifetime of the cell. While, in the case of mercury cell, the overall reaction does not involve the formation of any ion in the solution whose concentration can change during its life time.