High spin complex of a 3d metal ion M has a magnetic moment of 2.9 B.M. in octahedral coordination… · ABC26IN0133
Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Coordination Chemistry – General · Exam: CSIR NET 2018 · Marks: 2 · Difficulty: Medium
High spin complex of a 3d metal ion M has a magnetic moment of 2.9 B.M. in octahedral coordination environment and 4.1 B.M. in tetrahedral environment. The M ion is
(a)$\mathrm{Co^{2+}}$
(b)$\mathrm{Ni^{2+}}$
(c)$\mathrm{Cu^{2+}}$
(d)$\mathrm{Co^{2+}}$
Answer
Answer: B ✓ checked by 4AB · confidence high
The source book printed no answer; this one was worked out and checked — see the explanation.
Explanation
Ni²⁺ (d⁸): octahedral ³A₂g ground state has no orbital contribution, μ ≈ 2.8–3.0 BM; tetrahedral ³T₁ ground state carries an orbital contribution, μ ≈ 3.9–4.1 BM. So 2.9 BM is octahedral and 4.1 BM is tetrahedral.