The separation of trivalent lanthanide ions, Lu³⁺, Yb³⁺, Dy³⁺, Eu³⁺ can be effectively done by a cation… · ABC26IN0425

Subject: Inorganic Chemistry · Chapter: Lanthanides and Actinides · Topic: Lanthanide And Actinide – General · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Medium

The separation of trivalent lanthanide ions, $\mathrm{Lu}^{3+}, \mathrm{Yb}^{3+}, \mathrm{Dy}^{3+}, \mathrm{Eu}^{3+}$ can be effectively done by a cation exchange resion using ammonia o - hydroxy isobutyrate as the eluent. The order n which the ions willl be separated is
(a)$\mathrm{Lu}^{3+}, \mathrm{Yb}^{3+}, \mathrm{Dy}^{3+}, \mathrm{Eu}^{3+}$
(b)$\mathrm{Eu}^{3+}, \mathrm{Dy}^{3+}, \mathrm{Yb}^{3+}, \mathrm{Lu}^{3+}$
(c)$\mathrm{Dy}^{3+}, \mathrm{Yb}^{3+}, \mathrm{Eu}^{3+}, \mathrm{Lu}^{3+}$
(d)$\mathrm{Yb}^{3+}, \mathrm{Dy}^{3+}, \mathrm{Lu}^{3+}, \mathrm{Eu}^{3+}$
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
The smallest, most strongly complexed Ln³⁺ elutes first with α-hydroxyisobutyrate: Lu³⁺, Yb³⁺, Dy³⁺, Eu³⁺ (a).

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