why is magnisium ribbon rubbed with a sandpaper before burning it in air?
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Because magnisium rect easily with air to form it's oxides so it is rubbed by sand paper to burn it...
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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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