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 exhchange resins decreases as the size of alkali metal ions increases. Since, the order of size of alkali metal ions is
`Li^(+)ltNa^(+)ltK^(+)ltRb^(+)`
Thus, the ease of adsorption follows the order
`Rb^(+)ltK^(+)ltNa^(+)ltLi^(+)`