The ease of adsorption of the hydrated alkali metal ions on ion-exchange resins follows the order:

Options

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

Answer

D

Explanation

The ease of adsorption of hydrated alkali metal cations depends upon their size in hydrated form and on the charge carried by them.