Manganese dioxide is the inorganic compound with the formula MnO2. This blackish or brown solid occurs naturally in the main ore of manganese. It is also present in manganese nodules. The principal use for MnO2 is for dry-cell batteries, such as the alkaline battery and the zinc-carbon battery. It has a consumption of more than 1 million tonne every year for this purpose. MnO2 is also used for production of MnO4. It is used extensively as an oxidizing agent in organic synthesis.
Uses :
In ancient period it is used as a black or brown pigment. One of its first uses was in glass making,as a decolourising agent.
In modern times, the predominant application of MnO2 is as a component of dry cell batteries.
A specialized use of manganese dioxide is as an oxidant in organic synthesis.
The green salt potassium manganate is obtained in minutes when a solution of MnO2 in molten KOH or NaOH is treated with oxidizing agents such as potassium nitrate (KNO3), potassium perchlorate (KClO4), or even oxygen gas
