Q32 · CSIR NET Chemistry, June 2018
Paper: CSIR NET June 2018 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Term Symbols Spectra · Marks: 2 · Difficulty: Easy
The total degeneracy of the ground term of $\mathrm{Co}^{\mathrm{II}}$ (high spin) in octahedral geometry is
(a)18
(b)12
(c)28
(d)9
Answer
Answer: B ✓ checked by 4AB · confidence high
The source book printed C; on checking, B is correct — see the explanation.
Book printed (c) = free-ion ⁴F (28).
Explanation
High-spin octahedral Co(II): ground term ⁴T₁g, degeneracy (2S+1) × 3 = 4 × 3 = 12 (b).
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