Chemistry - Coordination Chemistry Question with Solution | TestHub

The magnetic moment of 5.9 B.M. indicates 5 unpaired electrons. Mn in [MnBr₄]²⁻ is in the +2 oxidation state ($d^5$ configuration). Since Br⁻ is a weak field ligand, it forms a high-spin complex. For a $d^5$ high-spin complex, the configuration is $e_g^2{t}_{2g}^3$ (or $t_{2g}^3{e}_g^2$ in tetrahedral). Tetrahedral geometry is favored for high-spin $d^5$ complexes with weak field ligands.

The correct statement is: It has tetrahedral geometry.