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(D) In $[CoF_6]^{3-}$,the oxidation state of $Co$ is $+3$. The atomic number of $Co$ is $27$,so its electronic configuration is $[Ar] 3d^7 4s^2$. For

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$sp^3d^2$

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(D) In $[CoF_6]^{3-}$,the oxidation state of $Co$ is $+3$. The atomic number of $Co$ is $27$,so its electronic configuration is $[Ar] 3d^7 4s^2$. For $Co^{3+}$,the configuration is $[Ar] 3d^6$. $F^-$ is a weak field ligand,so it does not cause pairing of electrons in the $3d$ orbitals. Therefore,the $3d$ electrons remain unpaired,and the hybridization involves the outer $4d$ orbitals. The hybridization is $sp^3d^2$.

The hybridization of the central metal ion in $[CoF_6]^{3-}$ is ....

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