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Hydrogen peroxide acts both as an oxidiz...

Hydrogen peroxide acts both as an oxidizing and as a reducing agent depending upon the nature of the reacting species. In which of the following cases `H_2O_2` acts as a reducing agent in acid medium?

A

`MnO_4-`

B

`Cr_2O_7^(2-)`

C

`SO_3^(2-)`

D

`KI`

Text Solution

Verified by Experts

The correct Answer is:
A
`2MnO_4^(-) + 6H^(+) + 5H_2O_2 to 2Mn^(2+) + SO_2 + 8H_2O`
In this reaction `KMnO_4` is reduced from +7 to +2 oxidation state. Thus, it acts añ oxidizing agent and `H_2O_2` act as a reducing agent in acidic medium.
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