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Low spin complex of d⁶-cation in an octahedral field will have the following energy:

1. -12/5 Δ₀ + P
2. -12/5 Δ₀ + 3P
3. -2/5 Δ₀ + 2P
4. -2/5 Δ₀ + P

Correct answer: -12/5 Δ₀ + 3P

Solution

In a low-spin d⁶ octahedral complex, all six electrons pair up in the t₂g orbitals due to strong field ligands. The crystal field stabilization energy (CFSE) is -12/5 Δ₀, and the pairing energy (P) is required for three pairs of electrons, giving a total energy of -12/5 Δ₀ + 3P.

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