Identify the coordination complexes in which the central metal ion has configuration [2025]

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Q.
Identify the coordination complexes in which the central metal ion has $d^{4}$ configuration.

Consider the correct answer from the options given below: [2025]

1 (A), (B) and (E) only

2 (C) and (E) only

3 (B) and (D) only

4 (B), (C) and (D) only

Ans.
(3)

S.No Complex Central metal ion Electronic configuration of central metal ion

(A) ${[{FeO}_{4}]}^{2 -}$ ${Fe}^{6 +}$ ${}_{18}{[Ar]}$ $3 d^{2}$

(B) ${[Mn {(CN)}_{6}]}^{3 -}$ ${Mn}^{3 +}$ ${}_{18}{[Ar]}$ $3 d^{4}$

(C) ${[Fe {(CN)}_{6}]}^{3 -}$ ${Fe}^{3 +}$ ${}_{18}{[Ar]}$ $3 d^{5}$

(D) ${Cr}_{2} {(O - CO - Me)}_{4} {(H_{2} O)}_{2}$ ${Cr}^{2 +}$ ${}_{18}{[Ar]}$ $3 d^{4}$

(E) ${[{NiF}_{6}]}^{2 -}$ ${Ni}^{4 +}$ ${}_{18}{[Ar]}$ $3 d^{6}$

Solution

Q.
Identify the coordination complexes in which the central metal ion has $d^{4}$ configuration.

Consider the correct answer from the options given below: [2025]

1 (A), (B) and (E) only

2 (C) and (E) only

3 (B) and (D) only

4 (B), (C) and (D) only

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S.No	Complex	Central metal ion	Electronic configuration of central metal ion
(A)	${[{FeO}_{4}]}^{2 -}$	${Fe}^{6 +}$	${}_{18}{[Ar]}$ $3 d^{2}$
(B)	${[Mn {(CN)}_{6}]}^{3 -}$	${Mn}^{3 +}$	${}_{18}{[Ar]}$ $3 d^{4}$
(C)	${[Fe {(CN)}_{6}]}^{3 -}$	${Fe}^{3 +}$	${}_{18}{[Ar]}$ $3 d^{5}$
(D)	${Cr}_{2} {(O - CO - Me)}_{4} {(H_{2} O)}_{2}$	${Cr}^{2 +}$	${}_{18}{[Ar]}$ $3 d^{4}$
(E)	${[{NiF}_{6}]}^{2 -}$	${Ni}^{4 +}$	${}_{18}{[Ar]}$ $3 d^{6}$

Solution

Q. Identify the coordination complexes in which the central metal ion has d4 configuration. Consider the correct answer from the options given below: [2025]

1 (A), (B) and (E) only

2 (C) and (E) only

3 (B) and (D) only

4 (B), (C) and (D) only

Ans. (3) S.No Complex Central metal ion Electronic configuration of central metal ion (A) [FeO4]2- Fe6+ [Ar]183d2 (B) [Mn(CN)6]3- Mn3+ [Ar]183d4 (C) [Fe(CN)6]3- Fe3+ [Ar]183d5 (D) Cr2(O-CO-Me)4(H2O)2 Cr2+ [Ar]183d4 (E) [NiF6]2- Ni4+ [Ar]183d6

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Q.
Identify the coordination complexes in which the central metal ion has $d^{4}$ configuration.

Consider the correct answer from the options given below: [2025]