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) \[R{{b}^{+}}>{{K}^{+}}>N{{a}^{+}}>L{{i}^{+}}\]
Correct Answer: D
Solution :
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 \[R{{b}^{+}}>{{K}^{+}}>N{{a}^{+}}>Li\]
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