Manganese Dioxide

Manganese Dioxide or Manganese(IV) oxide is the inorganic compound with the formula MnO₂. This blackish or brown solid occurs naturally as the mineral pyrolusite, which is the main ore of manganese and a component of manganese nodules. The principal use for MnO₂ is for dry-cell batteries, such as the alkaline battery and the zinc-carbon battery.MnO₂ is also used as a pigment and as a precursor to other manganese compounds, such as KMnO₄. It is used as a reagent in organic synthesis, for example, for the oxidation of allylic alcohols.

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