c
Magnetic moment \(1.73 \,\mathrm{BM}\)

\(\mu=\sqrt{n(n+2)} B \cdot M\)

\(\mathrm{n}=\) no. of unpaired \(e^-\)

\(\mu=1.73\)

\(1.73=\sqrt{n(n+2)} B \cdot M\)

\(n=1\)

\(\left[C o C l_{6}\right]^{4-} \rightarrow C o^{+2} ; d^{7}\)

\(\mathrm{Cl}^ -\) (weak field ligand) unpaired \(e^{-}=3\)

\(\left[C u\left(N H_{3}\right)_{4}\right]^{2+} C u^{+2}-d^{9}\)

\(N H_{3}\) Strong field ligand, hybridisation \(d s p^{2}\) one \(e^{-}\) of \(3 d\)

\(\left[N i(C N)_{4}\right]^{2-} \rightarrow N i^{+2}-d^{8}\) unpaired \(e^{-}=0\)

\(C N^{-}\) - Strong field ligand \(d s p^{2}\)

\(T i C l_{4} \rightarrow T i^{+4} d^{o}\) unpaired \(e^-=z e r o\)