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Why should a magnesium ribbon be cleaned before burning in air ?
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Answer : 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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Magnesium ribbon is cleaned with sandpaper before burning in air because it reacts with oxygen and forms a white layer of magnesium oxide and this layer is unable to burn.
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