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Question:

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

Answer:

Hydrogen peroxide, H2O2 acts as an oxidizing as well as a reducing agent in both acidic and alkaline media.

Reactions involving oxidizing actions are:

1)  2Fe2+ + 2H+  + H2O2  →  2Fe3+  +  2H2O

2) Mn2+  +  H2O2   →   Mn4+   +  2OH-

3) PbS  +  4H2O2    →   PbSO4  +  4H2O

4) 2Fe2+  + H2O2   →  2 Fe3+  + 2OH-

 

Reactions involving reduction actions are:
1)  2MnO-4  + 6H+  +  5H2O2  →  2Mn2+  +  8H2O  + 5O2

2) I2  + H2O2  +  2OH-   →   2l- + 2H2O + O2

3) HOCl  +  H2O2   →  H3O+  + Cl-  +  O2

4) 2MnO-4  +  3H2O2   →  2MnO2  +  3O2  + 2H2O  + 2OH-


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