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14/12/2021 1:57 pm
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In which of the following reactions, H2O2 is acting as a reducing agent
(a) H2O2 + SO2 → H2SO4
(b) 2KI + H2O2 → 2KOH + I2
(c) PbS + 4H2O2 → PbSO4 + 4H2O
(d) Ag2O + H2O2 → 2Ag + H2O + O2
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14/12/2021 2:00 pm
Correct answer: (d) Ag2O + H2O2 → 2Ag + H2O + O2
Explanation:
SO2 changes to H2SO4 (O.N. changes from +4 to +6 oxidation)
2KI → I2 (O.S. changes from –1 to 0 oxidation)
PbS → PbSO4 (O.S. changes from –2 to +6 oxidation)
Ag2O → 2Ag (O.S. changes from +1 to 0 reduction)