Why should a magnesium ribbon be cleaned before burning it in air?
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to avoid the immediate white lightening of the mg ribbon so as to avoid burning and oxidation. it is a highly reactive metal .
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♤ When Magnesium ribbon is exposed in the atmosphere it form a layer of magnesium oxide on its surface.
♤ This layer of magnesium oxide is stable compound to prevent further reaction of magnesium with oxygen.
♤ Hence, it should be cleaned before burning in air to remove this layer so that the metal can be exposed to air properly.
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