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?
MnO−4
Cr2O2−7
SO2−3
KI
A
MnO−4
B
Cr2O2−7
C
SO2−3
D
KI
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Solution
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The oxidation state of Mn in MnO−4 is +7. H2O2 can only reduce Mn as it is in maximum oxidation state in MnO−4.
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