The total degeneracy of the ground term of CoII (high spin) in octahedral geometry is · ABC26IN0132

Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Term Symbols Spectra · Exam: CSIR NET 2017 · Marks: 2 · Difficulty: Medium

The total degeneracy of the ground term of $\mathrm{Co^{II}}$ (high spin) in octahedral geometry is

(a)18

(b)12

(c)28

(d)9

Answer

Answer: B ✓ checked by 4AB · confidence medium

The source book printed C; on checking, B is correct — see the explanation.

The printed answer key points at a garbled option; 12 is the correct value.

Explanation

High-spin Co(II) (d⁷) in an octahedral field has the ground term ⁴T₁g. Its total degeneracy = spin multiplicity × orbital degeneracy = 4 × 3 = 12.

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