4AB › Chemistry PYQ › CSIR-NET › December 2013 › Q49Q49 · CSIR-NET Chemistry, December 2013 Paper: CSIR-NET December 2013 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Electron Transfer Redox · Marks: 2 · Difficulty: Medium
An octahedral metal ion $\mathrm{M}^{2+}$ has magnetic moment of 4.0 B.M. The correct combination of metal ion and d-electron configuration is given by
(a) $\mathrm{Co}^{2+}, \mathrm{t}_{2g}^{5}\mathrm{e}_{g}^{2}$
(b) $\mathrm{Cr}^{2+}, \mathrm{t}_{2g}^{4}\mathrm{e}_{g}^{2}$
(c) $\mathrm{Mn}^{2+}, \mathrm{t}_{2g}^{3}\mathrm{e}_{g}^{1}$
(d) $\mathrm{Fe}^{2+}, \mathrm{t}_{2g}^{4}\mathrm{e}_{g}^{2}$
Answer Answer: A ✓ checked by 4AB · confidence high
Explanation 4.0 BM ≈ three unpaired: high-spin Co²⁺ t₂g⁵e_g² (a).
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