\( \begin{array}{l}\mathrm{KMnO}_{4} \frac{\mathrm{H}^{+}}{\text {Reducing Agent }} \longrightar...

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\( \begin{array}{l}\mathrm{KMnO}_{4} \frac{\mathrm{H}^{+}}{\text {Reducing Agent }} \longrightarrow \mathrm{Mn}^{\mathrm{a}+} \\ \mathrm{KMnO}_{4} \frac{\mathrm{OH}^{-} \text {(weakly alkaline) }}{\text { Reducing Agent }} \mathrm{Mn}^{\mathrm{b}+} \\ \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \stackrel{\mathrm{OH}^{-}}{\longrightarrow} \mathrm{Cr}^{\mathrm{c}+} \\ \mathrm{a}+\mathrm{b}+\mathrm{c} \text { is: }\end{array} \)
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