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How can i make magnessium oxide from a battery?

The black stuff inside a battery is it Magnessium oxide, if so is it pure or impure? Help please cos i need it urgently !!!!
This is my email: oyekunlequadri@yahoo.com or oyekunleq@gmail.com

Just to clarify, the stuff in dry cell batteries is Manganese dioxide (MnO2) and not Magnesium oxide. I couldn't comment on the purity of it, but I wouldn't be surprised if it were not completely pure. Some gooleing about battery construction might get a definitive answer.
Quadry (author)  LargeMouthBass1 year ago
Thanks a lot!!!
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