A) \[L{{i}^{+}}>N{{a}^{+}}>{{K}^{+}}>R{{b}^{+}}\]
B) \[R{{b}^{+}}>{{K}^{+}}>N{{a}^{+}}>L{{i}^{+}}\]
C) \[N{{a}^{+}}>{{K}^{+}}>L{{i}^{+}}>R{{b}^{+}}\]
D) \[{{K}^{+}}>R{{b}^{+}}>N{{a}^{+}}>L{{i}^{+}}\]
Correct Answer: A
Solution :
Hydration energy \[\propto \frac{1}{size}\] Decreasing order of size is \[R{{b}^{+}}>{{K}^{+}}>N{{a}^{+}}>L{{i}^{+}}\] \[\therefore \] Increasing order of hydration energy is \[L{{i}^{+}}>N{{a}^{+}}>{{K}^{+}}>R{{b}^{+}}\]
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