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In which of the following reactions H2 O...

In which of the following reactions `H_2 O_2` acts as a reducing agent ?
I. `H_2 O_2 + 2H^+ + 2e^- to 2H_2 O`
II. `H_2 O_2 - 2re^- to 2H^+`
III. `H_2 O_2 + 2e^- to 2OH^-`
IV. `H_2 O_2 + 2OH^(-) - 2e^(-) to O_2 + 2H_2 O`

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In which of the following reactions H_2O_2 acts as a reducing agent ? (i) H_2O_2+2H^(+)+2e^(-)to 2H_2O (ii) H_2O_2-2e^(-) to O_2+2H^(+) (iii) H_2O_2+2e^(-) to 2OH^(-) (iv) H_2O_2+2OH^(-)-2e^(-) to O_2+2H_2O