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  • Hydrogen peroxide acts both as an  oxidising and as a reducing agent depending upon the nature of the reacting species. In which of the following cases H2O2 acts as a red

Hydrogen peroxide acts both as an  oxidising and as a reducing agent depending upon the nature of the reacting species. In which of the following cases H2O2 acts as a reducing agent in acid medium ?

Option: 1

MnO{_{4}}^{-}


Option: 2

Cr_{2}O_{7}^{2-}


Option: 3

SO_{3}^{2-}


Option: 4

KI


Answers (1)

best_answer

We have

     5H_{2}O_{2} + 2MnO_{4} + 6H^{+} \rightarrow 5O_{2}+2Mn^{2+} +8H_{2}O                  -1            +7                                    0                +2

Clearly, Mn goes from +7 oxidation state to +2, getting reduced and O in H2O2 goes from -1 oxidation state to 0, thereby acting as a reducing agent.

Therefore, option(1) is correct.

Posted by

Pankaj

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