On the basis of valence bond theory explain the oxidation state, hybridisation,geometry and magnetic nature of metal in complex $[C o F_{6}]^{3 -}$ .

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Solution

$(C o F_{6})^{- 3}$
$x + 6 (- 1) = - 3$
$x = + 3$ (Refer image $1$ ) refer image -II
outer hybridization.
$$ Due to unpaired $e^{-}$ paramagnetic in nature.
$$ Octahedral Geometry (Refer image $2$ )

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