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Identify the complex that represents a high spin octahedral arrangement.

1. eg orbitals with two unpaired electrons
2. t2g orbitals with three unpaired electrons
3. Crystal Field Stabilization Energy calculated as [0.6 × 1] + [−0.4 × 3] = −0.6 Δ0
4. A d4 configuration in a high spin octahedral field

Correct answer: A d4 configuration in a high spin octahedral field

Solution

A high spin octahedral complex with d4 configuration occurs when the ligand field splitting energy (Δ0) is less than the pairing energy, leading to maximum unpaired electrons in the t2g and eg orbitals.

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