Why should a magnesium ribbon be cleaned before burning in air 0?
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To remove the layer of magnesium oxide on the ribbon formed due to the presence of air.
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It is so because magnesium is a very reactive metal yet it reacts with oxygen present in the air and there is formula of magnesium oxide and the layer of magnesium is so stable that it prevents the for the reaction of magnesium with oxygen so that is why magnesium ribbon should be cleaned before burning in air
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