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Standard Electrode Potentials (E°)D & F Block

Why is $Cr^{2+}$ a reducing agent while $Mn^{3+}$ is an oxidizing agent (both are $d^4$ )?.

Expert Answer

$Cr^{2+}$ reduces to stable $d^3$ ( $t_{2g}^3$ ). $Mn^{3+}$ oxidizes to stable half-filled $d^5$ .

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