Identify the homoleptic complexes with odd number of electrons in the central metal: [2025]

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Q.
Identify the homoleptic complexes with odd number of electrons in the central metal: [2025]

(A) ${[{FeO}_{4}]}^{2 -}$
(B) ${[Fe {(CN)}_{6}]}^{3 -}$
(C) ${[Fe {(CN)}_{5} NO]}^{2 -}$
(D) ${[{CoCl}_{4}]}^{2 -}$
(E) $[Co {(H_{2} O)}_{3} F_{3}]$

Choose the correct answer from the options given below :

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

2 (C) and (E) only

3 (A), (B) and (D) only

4 (B) and (D) only

Ans.
(4)

S.No. Complex Electronic configuration of central metal ion before splitting Electrons in d orbital

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

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

(C) ${[Fe(CN)_{5} NO]}^{2 -}$ ${Fe}^{2 +} =$ ${}_{18}{[Ar]}$ $3 d^{6}$ Even

(D) ${[{CoCl}_{4}]}^{2 -}$ ${Co}^{2 +} =$ ${}_{18}{[Ar]}$ $3 d^{7}$ Odd

(E) $[Co(H_{2} O)_{3} F_{3}]$ ${Co}^{3 +} =$ ${}_{18}{[Ar]}$ $3 d^{6}$ Even

Solution

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

2 (C) and (E) only

3 (A), (B) and (D) only

4 (B) and (D) only

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S.No.	Complex	Electronic configuration of central metal ion before splitting	Electrons in d orbital
(A)	${[{FeO}_{4}]}^{2 -}$	${Fe}^{6 +} = {}_{18}{[Ar]}$ $3 d^{2}$	Even
(B)	${[Fe(CN)_{6}]}^{3 -}$	${Fe}^{3 +} =$ ${}_{18}{[Ar]}$ $3 d^{5}$	Odd
(C)	${[Fe(CN)_{5} NO]}^{2 -}$	${Fe}^{2 +} =$ ${}_{18}{[Ar]}$ $3 d^{6}$	Even
(D)	${[{CoCl}_{4}]}^{2 -}$	${Co}^{2 +} =$ ${}_{18}{[Ar]}$ $3 d^{7}$	Odd
(E)	$[Co(H_{2} O)_{3} F_{3}]$	${Co}^{3 +} =$ ${}_{18}{[Ar]}$ $3 d^{6}$	Even

Solution

Q. Identify the homoleptic complexes with odd number of electrons in the central metal: [2025] (A) [FeO4]2- (B) [Fe(CN)6]3- (C) [Fe(CN)5NO]2- (D) [CoCl4]2- (E) [Co(H2O)3F3] Choose the correct answer from the options given below :

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

2 (C) and (E) only

3 (A), (B) and (D) only

4 (B) and (D) only

Ans. (4) S.No. Complex Electronic configuration of central metal ion before splitting Electrons in d orbital (A) [FeO4]2- Fe6+=[Ar]183d2 Even (B) [Fe(CN)6]3- Fe3+=[Ar]183d5 Odd (C) [Fe(CN)5NO]2- Fe2+=[Ar]183d6 Even (D) [CoCl4]2- Co2+=[Ar]183d7 Odd (E) [Co(H2O)3F3] Co3+=[Ar]183d6 Even

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