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(D) $1$. The atomic number of $Co$ is $27$. The electronic configuration is $[Ar] 3d^7 4s^2$.$2$. In the complex $[CoF_6]^{3-}$,let the oxidation stat

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$4$

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(D) $1$. The atomic number of $Co$ is $27$. The electronic configuration is $[Ar] 3d^7 4s^2$.$2$. In the complex $[CoF_6]^{3-}$,let the oxidation state of $Co$ be $x$. Then $x + 6(-1) = -3$,which gives $x = +3$.$3$. The electronic configuration of $Co^{3+}$ is $[Ar] 3d^6$.$4$. $F^-$ is a weak field ligand,so it does not cause pairing of electrons.$5$. In the $3d^6$ configuration,the electrons are arranged as $t_{2g}^4 e_g^2$. This results in $4$ unpaired electrons.

The number of unpaired electrons in the complex $[CoF_6]^{3-}$ is ...... . (Atomic number of $Co = 27$)

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