The ease of adsorption of the hydrated alkali metal ions on the 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 the hydrated alkali metal ions on the ion-exchange resins decreases with the increase in the size of the alkali metal. The correct order of the sizes of the alkali metals is: `Li^(+) lt Na^(+) lt K^(+) lt Rb^(+)`