(i) Give a method for the manufacture of hydrogen peroxide and explain the reactions involved therein.

(ii) Illustrate oxidising, reducing and acidic properties of hydrogen peroxide with equations.

Answers (1)

Industrial preparation:H_2O_2 is prepared by the auto-oxidation of 2-alkylanthraquinols H_2O (l) + H_2S (aq) \rightarrow 

2Fe^{2+} + 2H^{+} + H_{2}O \rightarrow 2Fe^{3+} + 2 H_{2}O

PbS + H_{2}O_{2} \rightarrow PbSO_{4} + 4 H_{2}O

(ii) (a) Reducing action in acidic medium

2MnO^{-}_{4} + 6H^{+} + 5 H_{2}O_{2}\rightarrow 2Mn^{2+} + 8 H_{2}O + 5 O_{2}

HOCl + H_{2}O_{2} \rightarrow H_{3}O^{-} + Cl^{-} + O_{2}

(b)Oxidising action in basic medium

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

(c) 

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

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