Q .     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 `H_2O_2` acts as a reducing agent in acid medium?

JEE 2014 Mains Paper 2

(This question may have multiple correct answers)

A `MnO_4^-`
B `Cr_2O_{7}^{2-}`
C `SO_{3}^{2-}`
D `KI`
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