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Surface Chemistry
Question
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The ease of adsorption of the hydrated alkali metal ions on an ion exchange resins follows the order

  • Li+ > K+ >Na+> Rb+

  • Rb+ < K+ < Na+ < Li+

  • K+ >Na+>  Rb+ > Li+

  • Na+ < Li+ < K+ < Rb+

Answer

B.

Rb+ < K+ < Na+ < Li+

Ease of adsorption of the hydrated alkali metal ions on an ion-exchange resin decreases as the size of alkali metal ion increases.
since, the order of the size of alkali metal ions
Li+ < Na+ < K+ < Rb+

Thus,  the ease of adsorption follows the order
Rb+ < K+ < Na+ < Li+

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