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Question

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

A
MnO4
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B
SO23
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C
Kl
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D
Cr2O27
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Solution

The correct option is C MnO4
H2O2 when act as reducing agent, oxygen is reduced to H2O
(from 1 to 2)
H2O2+2H++2e2H2O
When H2O2 acts as oxidizing agent, oxygen is oxidized to O2 (from 1 to 0) and bubbles are noticed.
2MnO4+5H2O2+6H+5O2+2Mn2++8H2O

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