PG entrance exam CUET PG 2025 Mock Test Chemistry P - Block

In which of the following reactions the hydrogen peroxide acts as a reducing agent?

1
PbS + 4H2O2 → PbSO4 + 4H2O
2
Mn2+ + H2O2 → Mn4+ + 2OH− 
3
HOCl + H2O2 → H3O+ + Cl− + O2
4
2Fe2+ + H2O2 → 2Fe3+ + 2OH−
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