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(A) The central metal ion is $Co^{3+}$,which has an electronic configuration of $[Ar] 3d^6$.$NH_3$ is a strong field ligand,which causes pairing of el

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Low spin,diamagnetic

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(A) The central metal ion is $Co^{3+}$,which has an electronic configuration of $[Ar] 3d^6$.$NH_3$ is a strong field ligand,which causes pairing of electrons in the $3d$ orbitals.As a result,the $3d$ electrons are paired,leaving two $3d$ orbitals empty.These two $3d$,one $4s$,and three $4p$ orbitals hybridize to form $d^2sp^3$ hybrid orbitals.Since all electrons are paired,the complex is diamagnetic.Because the electrons are paired in the lower energy $d$ orbitals,it is a low spin complex.

Identify the correct pair of properties of the $[Co(NH_3)_6]^{3+}$ complex ion.

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$1$. $\text{trans}-[Co(NH_3)_4Cl_2]^+$
$2$. $\text{cis}-[Co(NH_3)_2(en)_2]^{3+}$
$3$. $\text{trans}-[Co(NH_3)_2(en)_2]^{3+}$
$4$. $[NiCl_4]^{2-}$
$5$. $[TiF_6]^{2-}$
$6$. $[CoF_6]^{3-}$
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