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 :
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 \[L{{i}^{+}}<N{{a}^{+}}<{{K}^{+}}<R{{b}^{+}}\] Thus, the ease of adsorption follows the order \[R{{b}^{+}}<{{K}^{+}}<N{{a}^{+}}<L{{i}^{+}}\]
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