Manganese dioxide is an inorganic compound with a chemical formula of MnO2. It is black amorphous powder or black orthorhombic crystal. It is insoluble in water, weak acid, weak base, nitric acid, and cold sulfuric acid. It dissolves in concentrated hydrochloric acid under heating and produces chlorine gas. It is used in the preparation of manganese salts, and is also used as an oxidizing agent, a rust remover, and a catalyst.

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