Question

The ionic mobility of alkali metal ions in aqueous solution is maximum for

• A. $L{i}^{+}$
• B. $R{b}^{+}$
• C. $L{i}^{+}$
• D. $N{a}^{+}$

Answer 1

The correct option is B

$R{b}^{+}$

The degree of hydration of alkali metal cations decreases as the size increases down the group. Therefore, smaller the effective size of the hydrated species higher the ionic mobility.