A transition metal（M）among Mn，Cr，Co and Fe has the highest standard electrode potential ( M 3+ / M 2+ ) ．If forms a metal complex of the type [ M ( CN ) 6 4- . ．The number of electrons present in the e g orbital of the complex is \ \ \ \ \

Chemistry · Coordination Compounds

JEE Main 2025 — 2 April, Morning Shift — Question 22

A transition metal（M）among Mn，Cr，Co and Fe has the highest standard electrode potential $\left(\mathrm{M}^{3+} / \mathrm{M}^{2+}\right)$ ．If forms a metal complex of the type $\left[\mathrm{M}(\mathrm{CN})_{6}{ }^{4-}\right.$ ．The number of electrons present in the $\mathrm{e}_{\mathrm{g}}$ orbital of the complex is $\_\_\_\_\_$

Answer: 1

Numerical answer — enter this value.

Step-by-step solution

$\mathrm{E}_{\mathrm{M}^{3+} / \mathrm{M}^{2+}}^{0}$ is highest for Co

$\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{4-}$

$\mathrm{Co}^{2+}: 4 s^{0} 3 d^{7}$

1 － $e_{9}$

$\mathrm{t}_{2 \mathrm{~g}}$

No．of $e^{-s}$ in $e_{g}$ orbital $=1$

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Exam: JEE Main 2025
Paper: 2 April, Morning Shift
Subject: Chemistry
Chapter: Coordination Compounds
Topic: Properties and importance of Coordination Complexes

Given below are two statements : one is labelled as Statement I and the other is labelled as Statement II: Statement I: In octahedral…

Answer: 1

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