The hexaquo manganese(II) ion contains five unpaired electrons, while the hexacynoion contains only one unpaired electron. Explain using crystal field theory.
In both case Mn is in the +2 oxidation state. In [Mn(H2O)]2- water is the weak field ligand. Therefore, the electrons arrangement of the electrons in is T2g3 eg2. In [Mn(CN)]4- cyanide is strong field ligand. Therefore, the arrangement of the electrons is T2g5 eg0.
Hence, hexaaquo manganese (ll) ion has five unpaired electrons, while hexacyano ion has only one unpaired electron.
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