Is manganese dioxide an amphoteric oxide?

Manganese dioxide is a black amorphous powder or black orthorhombic crystal. It is insoluble in water, weak acid, weak base, nitric acid, cold sulfuric acid, and is heated to dissolve in concentrated hydrochloric acid to produce chlorine.
It can be used to prepare manganese salts, and can also be used as an oxidant, rust remover and catalyst. Manganese dioxide is a strong oxidant. It can oxidize sulfur into sulfur dioxide, oxidize hydrochloric acid to produce chlorine, oxidize ammonia and ammonium salts to produce nitrogen, and oxidize organic compounds to carbon dioxide.
Manganese dioxide is an amphoteric oxide, with corresponding perovskite salts BaMnO3 or SrMnO3, as well as manganese tetrachloride. It becomes oxidizing when it encounters a reducing agent. Manganese dioxide is heated in an ammonia stream to obtain brown-black manganese dioxide. Manganese dioxide reacts with concentrated hydrochloric acid to form manganese chloride.
It can react with both acid and alkali. Mn2O3 is weakly acidic and weakly alkaline, and can be classified as an amphoteric oxide, but this state is unstable and usually returns to an amphoteric state.
Manganese dioxide is mainly used to produce high-performance dry batteries used in electrical appliances, flashlights, pagers, etc. This is because the oxygen produced by manganese dioxide can combine with the hydrogen produced by the battery cathode to form water, eliminating the battery polarization phenomenon.
Manganese dioxide can also be used as a catalyst. Because of its high activity and long life, it is often combined with other metal oxides to form catalysts.
Manganese dioxide has a wide range of uses and is an amphoteric oxide, so it is also very popular in the chemical community.

author: Hazel
date:2025-06-18