Paper: CSIR-NET June 2018 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Coordination Chemistry – General · 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
Explanation
Ni²⁺ d⁸: octahedral ³A₂g ground state, no orbital contribution, ≈2.9 BM; tetrahedral ³T₁ ground state with orbital contribution, ≈4.1 BM.