On the basis of VBT explain the hybridization, geometrical shape and magnetic property of `[CoF_(6)]^(3-)`, hexafluorido cobaltate (III) ion.

Explanation

Electronic configuration of `Co:[Ar]3d^(7)4s^(2)4p^(0)4d^(0)`

Under the influence of weak field fluoride ligands, in 3d orbitals of .C. electron pairing take place of Hund.s rule and cobalt undergo `sp^(3)d^(2)` hybridisation to give six hybrid orbtias.

Six `F^(-)` ligands donate six pairs of electrons and these electrons occupy in vacant hybrid orbits.
Due to `sp^(3)d^(2)` hybridisation the complex has octahedral geometry
Due to presence of unpaired electrons, the complex is paramagnetic.