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An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to
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increase in ionic mobility of ions
Key Idea $\lambda_{\text {eq }}=\kappa \times \mathrm{V}=\frac{\mathrm{k} \times 1000}{\text { normality }}$.
On dilution, the number of current carrying particles per $\mathrm{cm}^3$ decreases but the volume of solution increases. Consequently, the ionic mobility increases, which in turn increases the equivalent conductance of strong electrolyte.
On dilution, the number of current carrying particles per $\mathrm{cm}^3$ decreases but the volume of solution increases. Consequently, the ionic mobility increases, which in turn increases the equivalent conductance of strong electrolyte.
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