The correct order of ease of adsorption of the hydrated alkali...

The correct order of ease of adsorption of the hydrated alkali metal ions on an ion exchange resin is

Options

A $\mathrm{Rb}^{+}\gt\mathrm{K}^{+}\gt\mathrm{Na}^{+}\gt\mathrm{Li}^{+}$
B $\mathrm{Li}^{+} \lt \mathrm{K}^{+} \lt \mathrm{Na}^{+} \lt \mathrm{Rb}^{+}$
C $\mathrm{Na}^{+} \lt \mathrm{Li}^{+} \lt \mathrm{K}^{+} \lt \mathrm{Rb}^{+}$
D $\mathrm{K}^{+} \lt \mathrm{Na}^{+} \lt \mathrm{Rb}^{+} \lt \mathrm{Li}^{+}$

Correct answer

A. $\mathrm{Rb}^{+}\gt\mathrm{K}^{+}\gt\mathrm{Na}^{+}\gt\mathrm{Li}^{+}$

Step-by-step solution

(a) Ease of adsorption of the hydrated alkali metal ions on an ion exchange resin decreases as the size of the alkali metal ion increases. Since, the order of the size of the alkali metal ions is

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

. Thus, the ease of adsorption follows the order

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

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