Why should a magnesium ribbon be cleaned before burning in air?
NCERT Class 10th Science Chapter 1 Chemical Reactions and Equations
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when magnesium react with air it form magnesium oxide...this hinders the burning of magnesium .. hence layer is first removed by rubbing with sand paper before burning
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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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