Question

QU E S T I ON
Why should a magnesium ribbon be cleaned before burning in air​

Answer 1

Answer:

because it remove the protective layer on suface of magnesium ribbon by rubbing it with the help of sand paper

Explanation:

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Answer 2

magnesium ribbon must be cleaned before burning in the 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 chemical reaction