Identify reductant in following reaction. $\mathrm{C}_2 \mathrm{O}_4^{2-}+\mathrm{MnO}_4^{-}+\mathrm{H}^{+}…

Identify reductant in following reaction. $\mathrm{C}_2 \mathrm{O}_4^{2-}+\mathrm{MnO}_4^{-}+\mathrm{H}^{+} \longrightarrow \mathrm{Mn}^{2+}+\mathrm{CO}_2+\mathrm{H}_2 \mathrm{O}$
  1. $\mathrm{H}^{+}$
  2. $\mathrm{H}_2 \mathrm{O}$
  3. $\mathrm{C}_2 \mathrm{O}_4^{2-}$
  4. $\mathrm{MnO}_4^{-}$

Solution

$\stackrel{+3}{\mathrm{C}_2} \mathrm{O}_4^{2-}+\stackrel{+7}{\mathrm{MnO}_4^{-}}+\mathrm{H}^{+} \longrightarrow \stackrel{+2}{\mathrm{Mn}^{2+}} \mathrm{CO}_2+\mathrm{H}_2 \mathrm{O}$ The oxidation number of $\mathrm{C}$ increase from $+3\left(\mathrm{C}_2 \mathrm{O}_4^{2-}\right)$ to $+4\left(\mathrm{CO}_2\right)$ in above reaction. $\therefore\left(\mathrm{C}_2 \mathrm{O}_4^{2-}\right)$ acts as a reductant.

Asked in: MHT CET 2021 (20 Sep Shift 2)

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