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NEET 2012
Exam
NEET
Year
2012
Subject
Chemistry
Chapter
Surface Chemistry

NEET 2012 · Chemistry · Surface Chemistry

The ease of adsorption of the hydrated alkali metal ions on an...

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

Options

  1. ALi+<K+<Na+<Rb+\mathrm{Li}^{+} < \mathrm{K}^{+} < \mathrm{Na}^{+} < \mathrm{Rb}^{+}
  2. BRb+<K+<Na+<Li+\mathrm{Rb}^{+} < \mathrm{K}^{+} < \mathrm{Na}^{+} < \mathrm{Li}^{+}
  3. CK+<Na+<Rb+<Li+\mathrm{K}^{+} < \mathrm{Na}^{+} < \mathrm{Rb}^{+} < \mathrm{Li}^{+}
  4. DNa+<Li+<K+<Rb+\mathrm{Na}^{+} < \mathrm{Li}^{+} < \mathrm{K}^{+} < \mathrm{Rb}^{+}

Correct answer

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

Step-by-step 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 Li+<Na+<K+<Rb+\mathrm{Li}^{+} < \mathrm{Na}^{+} < \mathrm{K}^{+} < \mathrm{Rb}^{+} Thus, the ease of adsorption follows the order Rb+<K+<Na+<Li+\mathrm{Rb}^{+} < \mathrm{K}^{+} < \mathrm{Na}^{+} < \mathrm{Li}^{+}
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