In which of the following cases H 2 O 2 can act as a reducing agent in an acidic medium? (Hydrogen peroxide acts both as an oxidising and as well as a reducing agent depending upon the nature of the reacting species.)

Question

In which of the following cases H 2 O 2 can act as a reducing agent in an acidic medium? (Hydrogen peroxide acts both as an oxidising and as well as a reducing agent depending upon the nature of the reacting species.), KI, Cr 2 O 7 2 -, S O 3 2 -, Mn O 4 -

MARKS App · Accepted Answer

MnO 4 - + 8 H + + 5 e - → Mn 2 + + 4 H 2 O H 2 O 2 → O 2 + 2 H + + 2 e - H 2 O 2 acts as a reducing agent get oxidised 4 H 2 O 2 + K 2 Cr 2 O 7 + H 2 SO 4 → 2 CrO 5 + K 2 SO 4 + 5 H 2 O CrO 5 formation possibility is there, so K 2 Cr 2 O 7 not selected as choice but KMnO 4 selected.

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