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Why should magnesium ribbon be cleaned before burning in air

Answer» Because when mgreact with o2then it make inert protective layer of mgo.so mg ribbon cleaned before burning.
This done because mg react with atmospheric oxygen and form mgo2 so that it is clean before burning
It is so because magnesium reacts with oxygen present in air to form a layer of basic magnesium carbonate MgOH.MgCO³


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