An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to:

Options

A. increase in ionic mobility of ions
B. 100% ionisation of electrolyte at normal dilution
C. increase in both , i.e. number of ions and ionic mobility of ions
D. increase in number of ions

Answer

A

Explanation

(a) Key Idea `lambda_(eq)=kxxV=(kxx1000)/("Normality")`.
On dilution, the number of current carrying particles per `cm^(3)` decreases but the volume of solution increase. Consequently, the ionic mobility increase, which in turn increases the equivalent conductance of strong electrolyte.