First slide

Hydrogen Peroxide

Question

Hydrogen peroxide can act like an oxidant or a reductant. $H_{2} O_{2}$ acts like reducing agent in its reaction with

Moderate

A

$PbS$
B

${Fe}^{+ 2} / H^{+}$
C

${Mn}^{+ 2} / {OH}^{-}$
D

${MnO}_{4}^{-} / H^{+}$

Solution

$H_{2} O_{2} reduces {MnO}_{4}^{-} / H^{+} to {Mn}^{+ 2}; H_{2} O_{2} \to O_{2} + 2 H^{+} + 2 e; . . . . . . . . . \times 5 {MnO}_{4}^{-} + 8 H^{+} + 5 e \to {Mn}^{+ 2} + 4 H_{2} O; . . . . . . \times 2$ .
It oxidizes
${Mn}^{+ 2} \to {Mn}^{+ 4} {Fe}^{+ 2} \to {Fe}^{+ 3} PbS \to {PbSO}_{4}$

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