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The hexaquo manganese(II) ion contains five unpaired electrons, while the hexacyanoion contains only one unpaired electron. Explain using Crystal Field Theory.

9.10     The hexaquo manganese(II) ion contains five unpaired electrons, while the hexacyanoion contains only one unpaired electron. Explain using Crystal Field Theory.

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Consider Hexaqua manganese (II) :- In this compound, the oxidation state of Mn is +2 and its electronic configuration is d5.

H2O is a weak ligand and crystal field is octahedral so the arrangement of electrons will be   t23g eg2.

So the total number of unpaired electrons is 5.

Now consider hexacyanoion:-  In this compound, the oxidation state of Mn is +2. It is surrounded by the strong ligands CN-, so pairing will be there.

Its arrangement will be   t2g5 eg0.  

Thus the number of unpaired electrons will be 1.

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