In which of the following reactions does hydrogen peroxide act as a reducing agent?
- A$PbS + 4H_2O_2 \to PbSO_4 + 4H_2O$
- B$2KI + H_2O_2 \to 2KOH + I_2$
- C$Ag_2O + H_2O_2 \to 2Ag + H_2O + O_2$
- D$H_2SO_3 + H_2O_2 \to H_2SO_4 + H_2O$
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