Although [Fe(CN)6]4- is more stable (EAN-36) than [Fe(CN)6]3-(EAN-35) as par EAN rule but actually [Fe(CN)6]3 is more stable than [Fe(CN)6]4- ?

Although [Fe(CN)6]4- is more stable (EAN-36) than [Fe(CN)6]3-(EAN-35) as par EAN rule but actually  [Fe(CN)6]3 is more stable than  [Fe(CN)6]4- because in  Fe+3  Zeff will be more hence bonding between Fe+3 and -CN is more effective.

^{FACTOR'S AFFECTING STABILITY OF COMPLEXES:}

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