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The correct order of mobility of alkali ...

The correct order of mobility of alkali metal ions in aqueous solution is

A

`Li^(+) gt Na^(+) gt K^(+) gt Rb^(+)`

B

`Na^(+) gt K^(+) gt Rb^(+) gt Li^+`

C

`K^(+) gt Rb^(+) gt Na^(+) gt Li^(+)`

D

`Rb^(+) gt K^(+) gt Na^(+) gt Li^(+)`

Text Solution

Verified by Experts

The correct Answer is:
D
The correct order of the mobility of the alkali metal ions in aqueous solution is `Rb^(+) gt K^(+) gt Na^(+) gt Li^(+)` due to following order of hydration energy of these ions `Li^(+) gt Na^(+) gt K^+ gt Rb^+` and as the hydration of ion increases, mobility decreases.
Hydration enthalpy `prop 1/"Size of cation"`
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