The total degeneracy of the ground term of CoII (high spin) in octahedral geometry is

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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