\(\therefore \text { Unpaired } e ^{-}=5\)
\(\mu=\sqrt{ n ( n +2)}\)
\(=\sqrt{5(5+2)}\)
\(\mu=\sqrt{35}=5.92 \text { B.M. }\)
\({\left[ Fe ( CN )_6\right]^{-3}}\)
Pairing occur due to strong field ligand \(CN ^{-}\)
\(\therefore\) Unpaired \(e^-\) \(\Rightarrow 1\)
\(\mu=\sqrt{ n ( n +2)}\)
\(=\sqrt{1(1+2)}=\sqrt{3}=1.732 \text { B.M. }\)