Q34 · CSIR-NET Chemistry, June 2017

Paper: CSIR-NET June 2017 · Subject: Inorganic Chemistry · Chapter: Lanthanides and Actinides · Topic: Lanthanides & Actinides – General · Marks: 2 · Difficulty: Hard

The calculated and observed magnetic moments (in B.M.) of aqua complex of a lanthanide ion are 0 and ~3.5, respectively. The lanthanide ion is
(a)$\mathrm{Pm^{3+}}$
(b)$\mathrm{Pr^{3+}}$
(c)$\mathrm{Eu^{3+}}$
(d)$\mathrm{Sm^{3+}}$
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
Eu³⁺ (⁷F₀) has zero calculated moment for the ground level, yet ≈3.4–3.5 BM is observed because ⁷F₁ and ⁷F₂ are thermally populated.

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