Question

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

• 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. $N{a}^{+}<L{i}^{+}<K^{+}<R{b}^{+}$

Answer 1

The correct option is B

$R{b}^{+}<K^{+}<N{a}^{+}<L{i}^{+}$

The larger the sphere of hydration, the easier the adsorption. Hence, the order $R{b}^{+}<K^{+}<N{a}^{+}<L{i}^{+}$.