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#strong field ligands

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Colour and Magnetic Properties and Stability and Importance

Which complex has a d6 metal ion that remains paramagnetic even with strong field ligands in an octahedral field?

[Fe(CN)6]4− (Fe₂+, d6) with strong field CN− is low spin (t2g6), 0 unpaired electrons. [Co(H₂O)6]3+ (Co₃+, d6) with weaker H₂O is high spin, but [Fe(H₂O)6]2+ fits better contextually.

Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Colour and Magnetic Properties and Stability and Importance

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