Hydrogen peroxide is a highly versatile redox reagent. In which of the following specific reactions — Hydrogen Chemistry Question

💡 Solution & Explanation

$H_2O_2$ acts as a reducing agent when reacting with powerful oxidizers like $KMnO_4$ and $Ag_2O$, reducing $Mn^{7+}$ to $Mn^{2+}$ and $Ag^+$ to metallic $Ag$, while it gets oxidized to $O_2$ gas. In contrast, it acts as an oxidizing agent with $Fe^{2+}$ (oxidizing to $Fe^{3+}$) and $PbS$ (oxidizing to $PbSO_4$).