The species that has a spin-only magnetic moment of \(5.9\mathrm{BM}\), is \(\left({\mathrm{T}}_{\mathrm{d}}=\right.\) t…

\({\left[{\mathrm{MnBr}}_{4}\right]}^{2-}({\mathrm{T}}_{\mathrm{d}})\)

\({\left[{\mathrm{NiCl}}_{4}\right]}^{2-}({\mathrm{T}}_{\mathrm{d}})\)

\(\mathrm{Ni}(\mathrm{CO}{)}_{4}({\mathrm{T}}_{\mathrm{d}})\)

\({\left[\mathrm{Ni}(\mathrm{CN}{)}_{4}\right]}^{2-}\)(square planar)