Hydrogen peroxide
Reduction reactions

Under alkaline conditions, hydrogen peroxide is a reductant. When H O acts as a reducing agent, oxygen gas is also produced. For example, hydrogen peroxide will reduce sodium hypochlorite and potassium permanganate, which is a convenient method for preparing oxygen in the laboratory:

The oxygen produced from hydrogen peroxide and sodium hypochlorite is in the singlet state.

Hydrogen peroxide also reduces silver oxide to silver:

Although usually a reductant, alkaline hydrogen peroxide converts Mn(II) to the dioxide:

In a related reaction, potassium permanganate is reduced to Mn by acidic H O:
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