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

An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to
  1. increase in ionic mobility of ions
  2. $100 \%$ ionisation of electrolyte at normal dilution
  3. increase in both, ie, number of ions and ionic mobility of ions
  4. increase in number of ions

Solution

$\lambda_{\text {eq }}=\kappa \times \mathrm{V}=\frac{\mathrm{k} \times 1000}{\text { normality }}$. 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.

Asked in: NEET 2010 (Screening)

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