Question

Why should a magnesium ribbon be cleaned before burning in air?
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Answer 1

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Magnesium ribbon must be cleaned before burning in air so that the layer of Magnesium Oxide(which if formed due to the reaction of Magnesium with Air) can be removed in order to get the desired chemical reaction.

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Answer 2

Answer: magnesium ribbon should be cleaned with sandpaper . 2Mg + O2 = 2MgO

magnesium ribbon must be cleaned before burning in air so that the layer of magnesium oxide( which is formed due to reaction is magnesium with air )can be removed in order to get the desired chemical reaction.

Explanation:

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