Question

why should a magnesium ribbon be cleaned before burning​

Answer 1

Answer:

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Explanation:

Magnesium ribbon must be cleaned before burning in air so that 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.

Answer 2

Answer:

Magnesium when kept in air for long ,gets covered with a layer of magnesium oxide. so this layer of magnesium oxide is removed before burning the magnesium ribbon.