4AB › Chemistry PYQ › CSIR-NET › June 2016 › Q39Q39 · CSIR-NET Chemistry, June 2016 Paper: CSIR-NET June 2016 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Molecular Orbital Ligand Field · Marks: 2 · Difficulty: Easy
The complex that shows orbital contribution to the magnetic moment, is
(a) $\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$
(b) $\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$
(c) $\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$
(d) $\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$
Answer Answer: C ✓ checked by 4AB · confidence high
Explanation [Co(H₂O)₆]²⁺ has a ⁴T₁g ground term (orbitally degenerate) and shows a large orbital contribution (μ ≈ 4.8–5.2 BM); Cu²⁺ (²E_g), Ni²⁺ (³A₂g) and Cr²⁺ (⁵E_g) do not.
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