Coordination Compounds

Short Answer Type

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Which of the two is more stable K4[Fe(CN)6] or K3[Fe(CN)6].

In K4[Fe(CN)6] oxidation state of iron is +2.
where as in K3[Fe(CN)6] oxidation state is +3. Since both have strong field ligand therefore pairing occur. in case of +2 oxidation state all electron is paired such that the configuration is T2g6. But in case of +3 oxidation state the configuration is T2g5.Hence K3[Fe(CN)6] more stable because Fe3+ is smaller in size and has higher charge than Fe2+.
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