S.No.	Column-I (In fused state)	S.No.	Column-II (Conductivity in Ohm–1cm–1)
A)	H+	p)	350
B)	Na+	q)	50
C)	Li+	r)	39
D)	Cs+	s)	77

Conductivity K = C × $\frac{\mathrm{l}}{\mathrm{a}}$ ; K = conductivity
$\begin{array}{l}\mathrm{C}=(1/\mathrm{R})=(1\times \mathrm{a})/(\mathrm{\rho }\times \mathrm{l})\\ {\mathrm{H}}^{+}=349.80;{\mathrm{Na}}^{+}=50.11\\ {\mathrm{Li}}^{+}=38.66;{\mathrm{Cs}}^{+}=77.30\end{array}$

Down the group as size of ion increases,degree of hydration decreases and size of hydrated ion decreases. Ionic mobility increases. Though H⁺ is small in size, it exists in aqueous medium as H₃O⁺.

H⁺ continuosly oscillates between neighbouring water molecules due to which it's ionic mobility is very high.