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 $R{b}^{+}$

Smaller the size of cation, higher is its hydration energy and lesser is its ionic mobility. Hence the correct order is $L{i}^{+}<N{a}^{+}<K^{+}<R{b}^{+}$