magnesium ribbon has a coating of what ?
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Magnesium ribbon is rubbed before burning because it has a coating of basic magnesium oxide.
Magnesium oxide…Because before performing the activity of burning the ribbon in air we rub it with sandpaper in order to remove/get rid of the magnesium oxide coating on it.
calcium carbonate
According to me 2mg+ o2= 2mgo
calcium carbonate