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

1. Li+ < K+ < Na+ < Rb+
2. Rb+ < K+ < Na+ < Li+
3. K+ < Na+ < Rb+ < Li+
4. Na+ < Li+ < K+ < Rb+

Correct answer: Rb+ < K+ < Na+ < Li+

Solution

The ease of adsorption of hydrated alkali metal ions depends on their hydration enthalpy, which decreases as the size of the ion increases. Thus, smaller ions like Li+ are more strongly hydrated and less easily adsorbed, while larger ions like Rb+ are less hydrated and more easily adsorbed.

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