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

\(\left(\mathrm{A}\right){\left[{\mathrm{FeO}}_{4}\right]}^{2-}\\ \left(\mathrm{B}\right){\left[\mathrm{Mn}{\left(\mathrm{CN}\right)}_{6}\right]}^{3-}\\ \left(\mathrm{C}\right){\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_{6}\right]}^{3-}\\ \left(\mathrm{D}\right){\mathrm{Cr}}_{2}{\left(\mathrm{OCOMe}\right)}_{4}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{2}\\ \left(\mathrm{E}\right){\left[{\mathrm{NiF}}_{6}\right]}^{2-}\)

[JEE Main 2025, 23 Jan (Shift 2)]

Question

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

\(\left(\mathrm{A}\right){\left[{\mathrm{FeO}}_{4}\right]}^{2-}\\ \left(\mathrm{B}\right){\left[\mathrm{Mn}{\left(\mathrm{CN}\right)}_{6}\right]}^{3-}\\ \left(\mathrm{C}\right){\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_{6}\right]}^{3-}\\ \left(\mathrm{D}\right){\mathrm{Cr}}_{2}{\left(\mathrm{OCOMe}\right)}_{4}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{2}\\ \left(\mathrm{E}\right){\left[{\mathrm{NiF}}_{6}\right]}^{2-}\)

[JEE Main 2025, 23 Jan (Shift 2)]

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Identify the coordination complexes in which the central metal ion has \({\mathrm{d}}^{4}\) configuration \(\left(\mathr…

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