Manganese dioxide, the black substance used in the preparation of oxygen, has the formula MnO{2}.
In the laboratory chlorine is made by warming the mineral pyrolusite (manganese dioxide, MnO{2}) with concentrated hydrochloric acid.
It has been found, however, that if the potassium chlorate is mixed with about one fourth its weight of manganese dioxide, the oxygen is given off at a much lower temperature.
As in the case of chlorine, bromine can be prepared by the action of hydrobromic acid (HBr) on manganese dioxide.
Defn: Manganese dioxide, occurring in tetragonal crystals nearly as hard as quartz.
Black oxide of manganese, Manganese dioxideor peroxide, or Black manganese (Chem.
Defn: A compound of manganese dioxidewith a metallic oxide; so called as though derived from the hypothetical manganous acid.
Manganese dioxide, occurring in tetragonal crystals nearly as hard as quartz.
There is only a slight mechanical loss, which is reduced in the best managed works to about 2 parts of manganese dioxide to 100 of bleaching- powder.
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