Question

In which of the following reactions, hydrogen peroxide acts as an oxidizing agent?

• A. $\text{H}\text{O}\text{C}\text{l}+{\text{H}}_2{\text{O}}_2\to {\text{H}}_3{\text{O}}^{+}+\text{C}{\text{l}}^{-}+{\text{O}}_2$
• B. ${\text{I}}_2+{\text{H}}_2{\text{O}}_2+2\text{O}{\text{H}}^{-}\to 2{\text{I}}^{-}+2{\text{H}}_2\text{O}+{\text{O}}_2$
• C. $\text{P}\text{b}\text{S}+4{\text{H}}_2{\text{O}}_2\to \text{P}\text{b}\text{S}{\text{O}}_4+4{\text{H}}_2\text{O}$
• D. $2\text{M}\text{n}{\text{O}}_4^{-}+3{\text{H}}_2{\text{O}}_2\to 2\text{M}\text{n}{\text{O}}_2+3{\text{O}}_2+2{\text{H}}_2\text{O}+2\text{O}{\text{H}}^{-}$

Answer 1

Answer: (C)

$2e^{-}+2H^{+}+H_2{O}_2⟶2H_{2}O$ (reduction)

$S^{-2}+4H_{2}O⟶S{O}_4^{-2}+8H^{+}+8e^{-}($ oxidation $)$

(Equation. $1\times 4$ ) $+$ (Equation. 2 )

Final reaction $PbS+4H_2{O}_2⟶PbS{O}_4+4H_{2}O$