Question

Why should a magnesium
ribbon be cleared before burning in air?

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Answer 1

Answer:

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

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When Magnesium Ribbon is leave in the contact of air then it forms a layer magnesium oxide.

It will not burn if still there is layer of oxide on the ribbon. So for this reason, Magnesium Ribbon should be cleaned.

Hope this helps ✌✌✌