Question

The ease of adsorption of the hydrated alkali metal ions on
an ion-exchange resins follows the order :
(a) Li⁺ < K⁺ < Na⁺ < Rb⁺
(b) Rb⁺ < K⁺ (c) K⁺ < Na⁺ < Rb⁺ < Li⁺
(d) Na⁺ < Li⁺ < K⁺ < Rb⁺

Answer 1

The ease of adsorption of the hydrated alkali metal ions on  an ion-exchange resins follows the order  is Rb⁺ < K⁺ < Na⁺ < Li⁺.

Explanation:

• The ease of adsorption of the hydrated alkali metal ions on an ion-exchange resin follows the increasing order of Rb⁺ < K⁺ < Na⁺ < Li⁺.
• The ease of adsorption of the hydrated alkali metal ions in an ion-exchange resin decreases as size of alkali metal ions increases.
• And the order of increase in size of alkali metal ion is Li⁺ < Na⁺ < K⁺ < Rb⁺.
• Thus the ease of adsorption of the hydrated alkali metal ions on  an ion-exchange resins follows the order  is Rb⁺ < K⁺ < Na⁺ < Li⁺.

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Answer 2

Ease of adsorption of the hydrated alkali metal ions on  an ion-exchange resins follows the order :

$Rb^{+}$ < $K^{+}$ < $Na^{+}$ < $Li^{+}$

Explanation:

More is the size of an ion, more will be the surface area required by it for adsorption. Therefore, more difficulty it will face to get adsorbed.

Whereas smaller is the size of an ion, smaller will be the surface area required by it to get adsorbed. Therefore, more easily it will get adsorbed on an ion-exchange resin.

As the given ions are group 1 ions and size increases on moving down the group. Hence, ease of adsorption of the hydrated alkali metal ions on  an ion-exchange resins follows the order :

$Rb^{+}$ < $K^{+}$ < $Na^{+}$ < $Li^{+}$

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