In which of the following reaction(s) H 2 O 2 act as reducing agent?

Question

In which of the following reaction(s) H 2 ​ O 2 ​ act as reducing agent?

TestHub · Accepted Answer

Hydrogen peroxide (H₂O₂) acts as a reducing agent when its oxygen atoms, initially in the -1 oxidation state, are oxidized to 0 (in O₂).

A. In $P b S + 4 H_{2} O_{2} \to P b S O_{4} + 4 H_{2} O$ , oxygen in H₂O₂ goes from -1 to -2 (in H₂O), so H₂O₂ acts as an oxidizing agent.

B. In $2 K M n O_{4} + 3 H_{2} S O_{4} + 5 H_{2} O_{2} \to 2 M n S O_{4} + K_{2} S O_{4} + 8 H_{2} O + 5 O_{2}$ , oxygen in H₂O₂ goes from -1 to 0 (in O₂). H₂O₂ is a reducing agent.

C. In $H OCl + H_{2} O_{2} \to H Cl + H_{2} O + O_{2}$ , oxygen in H₂O₂ goes from -1 to 0 (in O₂). H₂O₂ is a reducing agent.

D. In $I_{2} + H_{2} O_{2} + 2 K O H \to 2 K I + 2 H_{2} O + O_{2}$ , oxygen in H₂O₂ goes from -1 to 0 (in O₂). H₂O₂ is a reducing agent.

Therefore, H₂O₂ acts as a reducing agent in reactions B, C, and D.

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