Chemistry - Complete d-block Question with Solution | TestHub

${\mathrm{E}}_{{\mathrm{Mn}}^{3+}/{\mathrm{Mn}}^{2+}}^{\circ }>{\mathrm{E}}_{{\mathrm{Cr}}^{3+}/{\mathrm{Cr}}^{2+}}^{\circ }\text{ or }{\mathrm{E}}_{{\mathrm{Fe}}^{3+}/{\mathrm{Fe}}^{2+}}^{\circ }$ Electronic configuration of ${\mathrm{Mn}}^{3+}=[\mathrm{Ar}]3d^4$ Electronic configuration of ${\mathrm{Mn}}^{2+}=[\mathrm{Ar}]3d^5$ Electronic configuration of ${\mathrm{Cr}}^{3+}=[\mathrm{Ar}]3d^3$ Electronic configuration of ${\mathrm{Cr}}^{2+}=[\mathrm{Ar}]3d^4$ As ${\mathrm{Mn}}^{3+}$ from $d^4$ configuration goes to more stable $d^5$ configuration (Half filled), due to more exchange energy in $d^5$ configuration.