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For octahedral d⁴ ion in strong field, electronic config:
At₂g³ e_g¹ (high spin, 4 unpaired)
Be_g⁴
Ct₂g⁴ e_g⁰ (low spin, 2 unpaired)
Dt₂g⁴ e_g²
Answer & Solution
Correct answer: C. t₂g⁴ e_g⁰ (low spin, 2 unpaired)
d⁴ strong field: pair electrons in lower set first → t₂g⁴ e_g⁰, 2 unpaired. d⁴ weak field: half-fill all 5 first → t₂g³ e_g¹, 4 unpaired. Crossover (high vs low spin) depends on Δ vs pairing energy P.
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