why should a magnesium ribbon be cleaned before burning in the air
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Magnesium ribbon must be cleaned before burning in air so that the 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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Answer:
Due to reaction between oxygen and magnesium a layer of magnesium oxide is formed over it . So , magnesium ribbon is cleaned to remove this undesirable layer .
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