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  • The ease of adsorption of the hydrated alkali metal ions on an ion-exchange resin follows the order Option: 1 Li+ < K+

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

Option: 1

Li+ < K+ < Na+ < Rb+


Option: 2

Rb+ < K+ < Na+ < Li+


Option: 3

K+ < Na+ < Rb+ < Li+


Option: 4

Na+ < Li+ < K+ < Rb+


Answers (1)

best_answer

The ease of absorption of alkali metals increases with an increase in the size of ions in an aqueous medium or a decrease in the size of non-hydrated ions. 

The smaller the size of the cation in the gas phase more is the size in the aqueous medium because the smaller the size in the gas phase more is hydration.

since, the order of the size of alkali metal ions in the gas phase

\mathrm{Li}^{+}<\mathrm{Na}^{+}<\mathrm{K}^{+}<\mathrm{Rb}^{+}

Thus, the ease of adsorption follows the order

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

The correct answer is option 2. 

Posted by

Rishabh

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