Question

The ease of absorption of the hydrated alkali metals ions in an ion-exchange resin follows the order:

Options

• Li⁺ < K⁺ < Na⁺ < Rb⁺

• Rb⁺ < K⁺ < Na⁺ < Li⁺

• K⁺ < Na⁺ < Rb⁺ < Li⁺

• Na⁺ < Li⁺ < K⁺ < Rb

Answer 1

Rb⁺ < K⁺ < Na⁺ < Li⁺

Explanation:

The ease of adsorption of the hydrated alkali metal ions on an ion-exchange resin reduces as the size of the alkali metal ion rises.

Since the order of size of alkali metals ions are

Li⁺ < Na⁺ < K⁺ < Rb⁺

Thus; the ease of adsorption follows the order

Rb⁺ < K⁺ < Na⁺ < Li⁺