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(C) $1$. The oxidation state of $Co$ in $[Co(NH_3)_6]^{3+}$ is $+3$.$2$. The electronic configuration of $Co^{3+}$ is $[Ar] 3d^6$.$3$. $NH_3$ is a str

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$d^2sp^3$ and diamagnetic

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(C) $1$. The oxidation state of $Co$ in $[Co(NH_3)_6]^{3+}$ is $+3$.$2$. The electronic configuration of $Co^{3+}$ is $[Ar] 3d^6$.$3$. $NH_3$ is a strong field ligand,which causes pairing of electrons in the $3d$ orbitals.$4$. After pairing,the $3d$ orbitals have two vacant $d$-orbitals,one $4s$ orbital,and three $4p$ orbitals available for hybridization.$5$. This results in $d^2sp^3$ hybridization,which is inner orbital octahedral geometry.$6$. Since all electrons are paired in the $3d$ orbitals,the complex is diamagnetic.

List-$I$ (Complex)	List-$II$ (Hybridization)
$A. Ni(CO)_4$	$I. sp^3d^2$
$B. [Ni(CN)_4]^{2-}$	$II. d^2sp^3$
$C. [Co(NH_3)_6]^{3+}$	$III. dsp^2$
$D. [CoF_6]^{3-}$	$IV. sp^3$

The hybridization and magnetic behaviour of the cobalt ion in the $[Co(NH_3)_6]^{3+}$ complex,respectively,are:

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Match the complexes in List-$I$ with their hybridization in List-$II$.
List-$I$ (Complex) List-$II$ (Hybridization)
$A. Ni(CO)_4$ $I. sp^3d^2$
$B. [Ni(CN)_4]^{2-}$ $II. d^2sp^3$
$C. [Co(NH_3)_6]^{3+}$ $III. dsp^2$
$D. [CoF_6]^{3-}$ $IV. sp^3$

The Jahn-Teller effect is not observed in high spin complexes of:

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

Briefly explain the Valence Bond Theory $(VBT)$.

The geometries of $Ni(CO)_4$ and $Ni(PPh_3)_2Cl_2$ are:

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