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) (E) [ NiF 6 ] 2- Choose the correct answer from the options given below :

Chemistry · Coordination Compounds

JEE Main 2025 — 23 January, Evening Shift — Question 37

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

(A) $\left[\mathrm{FeO}_{4}\right]^{2-}$

(B) $\left[\mathrm{Mn}(\mathrm{CN})_{6}\right]^{3-}$

(D) (E) $\left[\mathrm{NiF}_{6}\right]^{2-}$

Choose the correct answer from the options given below :

$\quad \mathrm{Fe}^{+6}=[\mathrm{Ar}] 3 \mathrm{~d}^{2}$

$\mathrm{Mn}^{+3}=[\mathrm{Ar}] 3 \mathrm{~d}^{4}$

$\mathrm{Fe}^{+3}=[\mathrm{Ar}] 3 \mathrm{~d}^{5}$

$\mathrm{Cr}^{+2}=[\mathrm{Ar}] 3 \mathrm{~d}^{4}$

$\mathrm{Ni}^{+4}=[\mathrm{Ar}] 3 \mathrm{~d}^{6}$

Answer key and solution verified before publishing.

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