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Hydrogen peroxide can act both as an oxi...

Hydrogen peroxide can act both as an oxidising as well as reducing agent. Expalin.

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The change in oxidation number accompanyin the decomposition of `H_(2)O_(2)` is as follows:

Since oxygen atom in `H_(2)O_(2)` can undergo an increase as well as decrease in oxidation number therefore, it can act both as reducing as well as oxidising agent. This is supported by the following reactions.
As reducing agent:
`" " overset(+1)(AgO)+underset("Reducing agent")(H_(2)overset(-1)(O_(2))) to 2overset(0)(Ag)+H_(2)O+overset(0)O_(2)`
In this reaction, `H_(2)O_(2)` acts as reducing agent and has reduced `Ag_(2)O` to metallic Ag.
As oxidising agent:
`" " Pboverset(+2)S+underset("Oxidising agent")(4H_(2)overset(-1)(O_(2))) to Pboverset(+6)(SO_(4))+4H_(2)O^(-2)`
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Knowledge Check

  • Hydrogen peroxide can act as:

    A
    a reducing agent
    B
    an oxidising agent
    C
    a dehydrating agent
    D
    a bleaching agent

  • Which acts both an oxidizing as well as reducing agent?

    A
    `HNO_3`
    B
    `HNO_2`
    C
    `H_2SO_4`
    D
    none of these

  • In which of the following cases H_(2)O_(2) can act as a reducing agent in an acidic medium? (Dydrogen peroxide acts both as an oxidising and as well as a reducing agent depending upon the nature of the reacting species.)

    A
    `KI`
    B
    `Cr_(2)O_(7)^(2-)`
    C
    `SO_(3)^(2-)`
    D
    `MnO_(4)^(-)`

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