The spin only magnetic moment value of `[MnBr_(4)]^(2-)` ion is `5.9BM` On the basis of `VBT` Predict the hybridisation and geometry of `[MnBr_(4)]^(2-)` ion ` .

Explanation

Since the coordination number of `Mn^(2+)` ion in the complex ion is 4, it
will be either tetrahedral (`sp^(3)` hybridisation) or square planar `(dsp^(2)`
hybridisation). But the fact that the magnetic moment of the complex
ion is 5.9 BM, it should be tetrahedral in shape rather than square
planar because of the presence of five unpaired electrons in the d orbitals.