Read the given passage and answer the questions numberthat follow : Weak electrolytes like acetic acid have lower degree of dissociation at higher concentrations and hence for such electrolytes, the change in Lambda_(m)with dilution is due to increase in the degree of dissociation and consequently the number of ions in total volume of solution that contains one mol of electrolyte. In such cases Lambda_(m)increases steeply on dilution, especially near lower concentrations. Therefore, Lambda_(m)cannot be obtained by extrapolation of Lambda_(m)to zero concentration. At infinite dilution (i.e., concentration c tozero) electrolyte dissociates completely (alpha= 1), but at such low concentration the conductivity of the solution is so low that it cannot be measured accurately. Therefore, Lambda_(m)^(@)for weak electrolytes is obtained by using Kohlrausch law of independence migration of ions. Why does the change in Am take place on dilution in case of weak electrolytes ?