Question

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

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

Answer 1

The correct option is D $R{b}^{+}$

Due to less charge density on $Rb$ ion, its hydration is low. So, the size of hydrated $R{b}^{+}$ is the smallest of all. Hence, it has maximum mobility.