Question

why should magnesium be cleaned before burning in air?​

Answer 1

Answer:

magnesium should be cleaned before burning in air because magnesium oxide can be removed in order to get the desired chemical reaction

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Answer 2

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.