Verified Solution • 2025–26 Session moderate

QJEEM25Ch6a1c: JEE Main 2025 Chemistry - Class 12 JEEM25Ch6a1c Solution: Identify the coordination complexes in which the central metal…

Identify the coordination complexes in which the central metal ion has d4\mathrm{d}^4 configuration.

(A) [FeO4]2−\left[\mathrm{FeO}_4\right]^{2-}

(B) [Mn(CN)6]3−\quad\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-}

(C) [Fe(CN)6]3−\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}

(D) JEE Main 2025 (Online) 23rd January Evening Shift Chemistry - Coordination Compounds Question 4 English (E) [NiF6]2−\left[\mathrm{NiF}_6\right]^{2-}

Choose the correct answer from the options given below :

Multiple Choice Options

  • A (B), (C) and (D) only
  • B (C) and (E) only
  • C (A),(B)(A),(B) and (E)(E) only
  • D (B) and (D) only

Step-by-Step Verified Solution

amp;Fe+6=[Ar]3 d2amp;Mn+3=[Ar]3 d4amp;Fe+3=[Ar]3 d5amp;Cr+2=[Ar]3 d4amp;Ni+4=[Ar]3 d6\begin{aligned}& \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\end{aligned}

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