Why does Ferricyanide ( [Fe(CN) 6] 3−) undergoes d2sp3 hybridisation? While hexaaquairon(III) ( [Fe(H2O) 6] 3+) undergoes sp3d2? Though both are paramagnetic and have octahedral geometry?

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Why does Ferricyanide ( [Fe(CN)6] 3−) undergoes d2sp3 hybridization? While hexaaquairon(III) ( [Fe(H2O) 6]3+) undergoes sp3d2? Though both are paramagnetic and have octahedral geometry?