Hydration energy of the given ions follows the order.

Options

A. `Li^(+) gt K^(+) gt Na^(+) gt Rb^(+) gt Cs^(+)`
B. `Cs^(+) gt Rb^(+) gt K^(+) gt Rb^(+) gt Cs^(+)`
C. `Na^(+) gt K^(+) gt Rb^(+) gt Cs^(+) gt Li^(+)`
D. ` Li^(+) gt Na^(+) gt K^(+) gt Rb^(+) gt Cs^(+)`

Answer

4

Explanation

`Li^(+) gt Na^(+) gt K^(+) gt Rb^(+) gt Cs^(+)`=Hydration energy order
`to` Size of cation increases
`to ` hydration energy decreases