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

Options

A. `Li^(+)ltK^(+)ltNa^(+)ltRb^(+)`
B. `Rb^(+)ltk^(+)ltNa^(+)ltLi^(+)`
C. `K^(+)ltNa^(+)ltRb^(+)ltLi^(+)`
D. `Na^(+)ltLi^(+)ltK^(+)ltRb^(+)`

Answer

B

Explanation

Ease of adsorption of the hydrated alkali metal ions on an ion-exchange resin decreases as the size of alkali metall ion increases. Since, the order os size of alkali metal ions
`Li^(+)lt Na^(+)lt K^(+)lt Rb^(+)`