• # question_answer The correct order of the mobility of the alkali metal ions in aqueous solution is A)  $L{{i}^{+}}>N{{a}^{+}}>{{K}^{+}}>R{{b}^{+}}$ B)  $N{{a}^{+}}>{{K}^{+}}>R{{b}^{+}}>L{{i}^{+}}$ C)  ${{K}^{+}}>R{{b}^{+}}>N{{a}^{+}}>L{{i}^{+}}$ D)  $R{{b}^{+}}>{{K}^{+}}>N{{a}^{+}}>L{{i}^{+}}$

The correct order of hydration energy of the alkali metal ions in aqueous solutions is $L{{i}^{+}}>N{{a}^{+}}>{{K}^{+}}>R{{b}^{+}}$and due to hydration of ion, mobility decreases. Thus, the correct order of the mobility of these ions is $R{{b}^{+}}>{{K}^{+}}>N{{a}^{+}}>Li$