Chemistry - Electrochemistry Question with Solution | TestHub

Ionic mobility depends upon the charge to size ratio of ion. The ionic size in case of hydrated cation is
${\mathrm{\text{K}}}^{+}\left(\text{a}\text{q}\right)<{\mathrm{\text{N}}\mathrm{\text{a}}}^{+}\left(\text{a}\text{q}\right)<{\mathrm{\text{L}}\mathrm{\text{i}}}^{+}\left(\text{a}\text{q}\right)$
size of cation is less, will attracted by more${\text{H}}_{\text{2}}\text{O}$molecules so becomes more bulky hence, does not move easily.