James Hoffmann on Instagram: "The supercritical carbon dioxide process uses carbon dioxide under high pressure and temperature to remove caffeine from the beans. It might sound technical and seven days in liquid CO₂ sounds extreme, but it’s one of the cleaner and more efficient ways of producing decaf and is used more widely than you might expect. Had you heard of this process?"

Manganese is extracted from Manganese dioxide by reaction with ... | Filo

Chlorine is prepared in the laboratory by treating manganese dioxide (MnO2) with aqueous hydrochloric acid according to the reaction - Chemistry | Shaalaa.com