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Question

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


A

Li+<K+<Na+<Rb+

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B

Rb+<K+<Na+<Li+

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C

K+<Na+<Rb+<Li+

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D

Na+<Li+<K+<Rb+

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Solution

The correct option is B

Rb+<K+<Na+<Li+


The larger the sphere of hydration, the easier the adsorption. Hence, the order Rb+<K+<Na+<Li+.


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