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H2O2 acts as a reducing agent in

(1) 2NaOCl + H2O2 → 2NaCl + H2O + O2

(2) 2fe2+ + 2H+ + H2O2 → 2Fe3+ + 2H2O

(3) Mn2+ 2H2O2 → MnO2 + 2H2O

(4) Na2S + 4H2O2 → Na2SO4 + 4H2O

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