The compound that can work both as an oxidising and reducing agent is

  • Option 1)

    KMnO_4

  • Option 2)

    H_2O_2

  • Option 3)

    Fe_2(SO_4)_3

  • Option 4)

    K_2Cr_2O_7

 

Answers (1)

As we learnt in 

Rules for Oxidation Number -

The oxidation number of oxygen in most compounds is -2. There are two exceptions.
In peroxide (H2O2; Na2O2),  the oxidation number is -1.

- wherein

In superoxide e.g. KO2 its oxidation number is -1/2.

 

 In H_{2}O_{2}, the oxidation number of o is -1 which makes it possible for H_{2}O_{2}, to act both as oxidising or reducing agent.

\therefore Solution is 2


Option 1)

KMnO_4

Incorrect

Option 2)

H_2O_2

Correct

Option 3)

Fe_2(SO_4)_3

Incorrect

Option 4)

K_2Cr_2O_7

Incorrect

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