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(B) In $[CoF_{6}]^{3-}$,the oxidation state of $Co$ is $+3$.The electronic configuration of $Co^{3+}$ is $[Ar] 3d^{6}$.Since $F^{-}$ is a weak field l

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$sp^{3}d^{2}$ and octahedral

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(B) In $[CoF_{6}]^{3-}$,the oxidation state of $Co$ is $+3$.The electronic configuration of $Co^{3+}$ is $[Ar] 3d^{6}$.Since $F^{-}$ is a weak field ligand $(WFL)$,it does not cause pairing of electrons in the $3d$ orbitals.Therefore,the $Co^{3+}$ ion uses one $4s$,three $4p$,and two $4d$ orbitals to form six hybrid orbitals.This results in $sp^{3}d^{2}$ hybridisation.The geometry associated with $sp^{3}d^{2}$ hybridisation is octahedral.

What is the type of hybridisation and the geometry respectively found in $[CoF_{6}]^{3-}$?

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