question_answer

The ease of adsorption of the hydrated alkali metal ions on an ion-exchange resins follows the order [AIPMT (S) 2012]

A) \[L{{i}^{+}}<{{K}^{+}}<N{{a}^{+}}<R{{b}^{+}}\]

B) \[R{{b}^{+}}<{{K}^{+}}<N{{a}^{+}}<L{{i}^{+}}\]

C) \[{{K}^{+}}<N{{a}^{+}}<R{{b}^{+}}<L{{i}^{+}}\]

D) \[N{{a}^{+}}<L{{i}^{+}}<{{K}^{+}}<R{{b}^{+}}\]

Correct Answer: B

Solution :

[b] Ease of adsorption of the hydrated alkali metal ions on an ion-exchange resins decreases as the size of alkali metal ions increases. Since, the order of size of alkali metal ions Thus, the ease of adsorption follows the order