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(C) To find the $d$-configuration of the central metal ion, we determine the oxidation state of the metal in each complex:$(A)$ In $[FeO_4]^{2-}$, $Fe

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$(B)$ and $(D)$ only

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(C) To find the $d$-configuration of the central metal ion, we determine the oxidation state of the metal in each complex:$(A)$ In $[FeO_4]^{2-}$, $Fe + 4(-2) = -2 \implies Fe = +6$. $Fe^{6+} = [Ar] 3d^2$.$(B)$ In $[Mn(CN)_6]^{3-}$, $Mn + 6(-1) = -3 \implies Mn = +3$. $Mn^{3+} = [Ar] 3d^4$.$(C)$ In $[Fe(CN)_6]^{3-}$, $Fe + 6(-1) = -3 \implies Fe = +3$. $Fe^{3+} = [Ar] 3d^5$.$(D)$ In $[Cr(H_2O)_6]^{2+}$, $Cr + 6(0) = +2 \implies Cr = +2$. $Cr^{2+} = [Ar] 3d^4$.$(E)$ In $[NiF_6]^{2-}$, $Ni + 6(-1) = -2 \implies Ni = +4$. $Ni^{4+} = [Ar] 3d^6$.The complexes with $d^4$ configuration are $(B)$ and $(D)$.

List-$I$ (Complex)	List-$II$ (Hybridisation of central metal ion)
$A$. $[CoF_6]^{3-}$	$I$. $d^2sp^3$
$B$. $[NiCl_4]^{2-}$	$II$. $sp^3$
$C$. $[Co(NH_3)_6]^{3+}$	$III$. $sp^3d^2$
$D$. $[Ni(CN)_4]^{2-}$	$IV$. $dsp^2$

Identify the coordination complexes in which the central metal ion has $d^4$ configuration.
$(A)$ $[FeO_4]^{2-}$
$(B)$ $[Mn(CN)_6]^{3-}$
$(C)$ $[Fe(CN)_6]^{3-}$
$(D)$ $[Cr(H_2O)_6]^{2+}$
$(E)$ $[NiF_6]^{2-}$
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Similar Questions

Which of the following statements is not true?

Match List-$I$ with List-$II$.
List-$I$ (Complex) List-$II$ (Hybridisation of central metal ion)
$A$. $[CoF_6]^{3-}$ $I$. $d^2sp^3$
$B$. $[NiCl_4]^{2-}$ $II$. $sp^3$
$C$. $[Co(NH_3)_6]^{3+}$ $III$. $sp^3d^2$
$D$. $[Ni(CN)_4]^{2-}$ $IV$. $dsp^2$
Choose the correct answer from the options given below:

Number of identical $Cr-O$ bonds in dichromate ion $Cr_2O_7^{2-}$ is

Which of the following statements is incorrect for the complex $[Cr(NH_3)_6]Cl_3$?

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Identify the coordination complexes in which the central metal ion has $d^4$ configuration.$(A)$ $[FeO_4]^{2-}$$(B)$ $[Mn(CN)_6]^{3-}$$(C)$ $[Fe(CN)_6]^{3-}$$(D)$ $[Cr(H_2O)_6]^{2+}$$(E)$ $[NiF_6]^{2-}$Choose the correct answer from the options given below: