Question

The correct order of mobility of alkali metal ions in aqueous solution is

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

Answer 1

The correct option is B $R{b}^{+}>K^{+}>N{a}^{+}>L{i}^{+}$

Smaller the size of the ion, more is the hydration sphere and therefore, lesser is the mobility.