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What can be inferred from the magnetic moment values of the following complex species?
Example Magnetic Moment (BM)
K4[Mn(CN)6] 2.2
[Fe(H2O)6]2+ 5.3
K2[MnCl4] 5.9
Asked by Sarita Last Modified
Answer Magnetic moment (
) is given as
.
For value n = 1, 
.
For value n = 2, 
.
For value n = 3, 
.
For value n = 4, 
.
For value n = 5, 
.
(i) K4[Mn(CN)6]
For in transition metals, the magnetic moment is calculated from the spin-only formula. Therefore,
We can see from the above calculation that the given value is closest to
. Also, in this complex, Mn is in the +2 oxidation state. This means that Mn has 5 electrons in the d-orbital.
Hence, we can say that CN− is a strong field ligand that causes the pairing of electrons.
(ii) [Fe(H2O)6]2+
We can see from the above calculation that the given value is closest to
. Also, in this complex, Fe is in the +2 oxidation state. This means that Fe has 6 electrons in the d-orbital.
Hence, we can say that H2Ois a weak field ligand and does not cause the pairing of electrons.
(iii) K2[MnCl4]
We can see from the above calculation that the given value is closest to
. Also, in this complex, Mn is in the +2 oxidation state. This means that Mn has 5 electrons in the d-orbital.
Hence, we can say that Cl− is a weak field ligand and does not cause the pairing of electrons.
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