Question

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

Answer 1

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☞ When it is kept in the open air it can react with the gases present in the air. Cleaning will remove those impurities formed due to the reaction with air. Let us see why it is important to clean the surface of the magnesium ribbon before burning it. - Magnesium is an alkaline earth metal.

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Answer 2

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A magnesium ribbon should be cleaned before burning in air because magnesium when exposed to air reacts with oxygen which leads to the the formation of magnesium oxide on the surface of magnesium ribbon.