Question

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

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

Answer 1

Answer: (B)

increase in the ionic mobility of ions

Answer 2

$?_{eq}=k \times V= \frac {k \times 1000}{Normality}$
On dilution, the number of current carrying particles per $cm^3$ decreases but the volume of solution increases.
Consequently, the ionic mobility increases, which in turn increases the equivalent conductance of strong electrolyte.