For the tetrahedral complex [MnBr4]2-, the spin only magnetic moment value is: [At. no. of Mn= 25]

MnBr4−2Ox.State of Mnx+4−1  =  −2x=+2Mn(Z = 25) ……. [Ar]4s23d5  Mn+2 ……. [Ar]3d5Given that MnBr4−2  is a tetrahedral complex. ∴  No rearrangement occurs.Number of unpaired electrons(n) = 5μS=nn+2  B.MμS=55+2  B.MμS=5.9  B.MNote:–  In the formation of complex only vacant orbitals involve in hybridization.