Why should a magnesium ribbon be cleaned before burning in air?
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A magnesium ribbon should be cleaned before burning in air because when it comes in contact with air (oxygen ), its first layer gets oxidized preventing it from burning.
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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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