9.25  Write chemical reactions to justify that hydrogen peroxide can function as an oxidising as well as reducing agent.

Answers (1)

Hydrogen peroxide acts as oxidants as well as a reductant in both acidic and alkaline medium.

reactions for oxidizing agent-

\\2Fe^{2+}(aq)+2H^{+}(aq)+H_{2}O_{2}(aq)\rightarrow 2Fe^{3+}(aq)+2H_{2}O(l)\\PbS(s)+4H_{2}O_{2}(aq)\rightarrow PbSO_{4}(s)+4H_{2}O(l)

\\2Fe^{2+}+H_{2}O_{2}\rightarrow 2Fe^{3+}+2OH^{-}\\Mn^{2+}+H_{2}O_{2}\rightarrow Mn^{4+}+2OH^{-}

reactions for reducing agent-

\\2MnO_{4}^{-}6H^{+}+5H_{2}O_{2}\rightarrow 2Mn^{2+}+8H_{2}O+5O_{2}\\HOCl+H_{2}O_{2}\rightarrow H_{3}O^{+}+Cl^{-}+O_{2}

\\I_{2}+H_{2}O_{2}+2OH^{-}\rightarrow 2I^{-}+2H_{2}O+O_{2}\\2MnO_{4}^{-}+3H_{2}O_{2}\rightarrow 2MnO_{2}+3O_{2}+2H_{2}O+2OH^{-}

 

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