Question Bank › Inorganic Chemistry › Lanthanides and Actinides › ABC26IN1209The correct order of the retention of cations on a sulfonated cation exchange resin column is · ABC26IN1209 Subject: Inorganic Chemistry · Chapter: Lanthanides and Actinides · Topic: Lanthanides & Actinides – General · Exam: CSIR NET DEC 2014 · Marks: 2 · Difficulty: Hard
The correct order of the retention of cations on a sulfonated cation exchange resin column is
(a) $\mathrm{Ag}^{+}>\mathrm{K}^{+}>\mathrm{Na}^{+}>\mathrm{Li}^{+}$
(b) $\mathrm{K}^{+}>\mathrm{Na}^{+}>\mathrm{Ag}^{+}>\mathrm{Li}^{+}$
(c) $\mathrm{Li}^{+}>\mathrm{Na}^{+}>\mathrm{K}^{+}>\mathrm{Ag}^{+}$
(d) $\mathrm{Li}^{+}>\mathrm{Na}^{+}>\mathrm{Ag}^{+}>\mathrm{K}^{+}$
Answer Answer: A ✓ checked by 4AB · confidence high
Explanation Retention on a sulfonated resin increases with the polarisability/charge density of the cation in its hydrated form: Ag⁺ > K⁺ > Na⁺ > Li⁺ (the small, heavily hydrated Li⁺ is held least).
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