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

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

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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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Rakesh

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