What can be inferred from the magnetic moment values of the following complex species ?`{:("Example","Magnetic",(BM)),(K_(4)[Mn(CN)_(6)),2.2),([Fe(H_(2)O)_(6)]^(2+),5.3),(K_(2)[MnCl_(4)],5.9):}`

Explanation

The value of magnetic moment `(mu)` in `(BM)` are as follows:
When `n=1,mu=sqrt(3)=1.75`
`n=2,mu=sqrt(8)=2.76`
`n=3,mu=sqrt(15)=3.86`
`n=4,mu=sqrt(24)=4.80`
`n=5,mu=sqrt(35)=5.96`
(a). `K_4(Mn(CN)_6]^(4-),Mn^(2+)=3d^(5),mu=2.2BM`
`mu` value suggest that it has only one unpaired electron, which is due to the pairing of electrons by strong field `CN^(ɵ)` ligand.

(b). `[Fe(H_2O)_6]^(2+),Fe^(2+)=3d^(6),mu=5.3BM`
`mu` value suggest that it has 4 unpaired electrons. Since `H_2O` is a weak field ligand, thus no pairing of d-electrons occurs.

(c). `K_2[MnCl_4]Mn^(2+)=3d^(5),mu=5.92BM`
`mu` value suggests that it has 5 unpaired electrons. Since `Cl^(ɵ)` ion is a wak field ligand thus no pairing of d-electrons occurs.