The hybridization and magnetic nature of $${[Mn{(CN)_6}]^{4 - }}$$ and $${[Fe{(CN)_6}]^{3 - }}$$, respectively are :

The calculated magnetic moments (spin only value) for species $${[FeC{l_4}]^{2 - }}$$, $${[Co{({C_2}{O_4})_3}]^{3 - }}$$ and $$MnO_4^{2 - }$$ respectively are :

For a d⁴ metal ion in an octahedral field, the correct electronic configuration is :

The species that has a spin-only magnetic moment of 5.9 BM, is :
(T_d = tetrahedral)