JEE MAIN - Chemistry (2025 - 23rd January Evening Shift - No. 12)
Identify the coordination complexes in which the central metal ion has $\mathrm{d}^4$ configuration.
(A) $\left[\mathrm{FeO}_4\right]^{2-}$
(B) $\quad\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-}$
(C) $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$
(D) _23rd_January_Evening_Shift_en_12_1.png)
(E) $\left[\mathrm{NiF}_6\right]^{2-}$
Choose the correct answer from the options given below :
(B), (C) and (D) only
(C) and (E) only
$(A),(B)$ and $(E)$ only
(B) and (D) only
Explanation
$$\begin{aligned}
& \mathrm{Fe}^{+6}=[\mathrm{Ar}] 3 \mathrm{~d}^2 \\
& \mathrm{Mn}^{+3}=[\mathrm{Ar}] 3 \mathrm{~d}^4 \\
& \mathrm{Fe}^{+3}=[\mathrm{Ar}] 3 \mathrm{~d}^5 \\
& \mathrm{Cr}^{+2}=[\mathrm{Ar}] 3 \mathrm{~d}^4 \\
& \mathrm{Ni}^{+4}=[\mathrm{Ar}] 3 \mathrm{~d}^6
\end{aligned}$$
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