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 should be cleaned before burning it into a because magnesium is considered as one of the most reactive metal which react with its atmospheric gases like Oxygen and Carbon dioxide in forms the oxide and carbonate layers helps to prevent the slow down process of burning we generally remove the magnesium ribbon layered before burning