c
\(\left[\mathrm{FeF}_6\right]^{3-}: \mathrm{Fe}^{+3}:[\mathrm{Ar}] 3 \mathrm{~d}^5\)

\(IMAGE\)

F : Weak field Ligand No. of unpaired electron'\(s=5\)

\( \mu=\sqrt{5(5+2)} \)

\( \mu=\sqrt{35} \mathrm{BM} \)

\( {\left[\mathrm{V}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{+2}: \mathrm{V}^{+2}: 3 \mathrm{~d}^3}\)

\(IMAGE\)

No. of unpaired electron's \(=3\)

\( \mu=\sqrt{3(3+2)} \)

\( \mu=\sqrt{15} \mathrm{BM} \)

\( {\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{+2}: \mathrm{Fe}^{+2}: 3 \mathrm{~d}^6}\)

\(\mathrm{H}_2 \mathrm{O}\) : Weak field Ligand

\(IMAGE\)

No. of unpaired electron's\(=4\)

\( \mu=\sqrt{4(4+2)} \)

\( \mu=\sqrt{24} \mathrm{BM}\)