Question

Why should a magnesium ribbon be cleaned before it is burnt in air?

Answer 1

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When stored it reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of magnesium oxide being a stable compound prevents further reaction of magnesium with oxygen. The magnesium is cleaned before burning in air to remove this layer so that the metal can be exposed to air properly

Answer 2

magnesium ribbon be cleaned before it. Into air because magnesium is considered as one of the most reactive metals in the nature and which reacts with atmospheric gases like carbon dioxide and oxygen and to remove this layer of carbonate and oxide which generally remove remove it to which prevent the burning