Question

Why should a magnesium ribbon be cleaned before it is burnt in air?

Answer 1

Magnesium is highly reactive metal. It reacts with oxygen and forms a layer. This layer stops further reaction so It should be cleaned with sand paper to remove that layer so it can react fully when burnt.

Answer 2

Answer:

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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.

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Hope it Helps !!!!