Why should magnesium ribbon be rubbed in sandpaper before burning?
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To remove the coating of magnesium oxide which was form due to action of oxygen present in atmosphere.
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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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