Why should magnesium ribbon be cleaned before burning in air?
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Magnesium reacts with oxygen to form magnesium oxide which does not burn in air. Therefore, to remove the oxide layer from the surface of the magnesium ribbon, we should clean the magnesium ribbon using sandpaper before burning in air.
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Answer:Magnesium ribbon must be cleaned before burning in air so that the layer of magnesium oxide (which is formed due to reaction of magnesium with air) can be removed in order to get the desired chemical reaction.
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