Question

why should a magnesium ribbon be cleaned before burning in air​

Answer 1

Hey mate ☺️,

Answer: Magnesium ribbon must becleaned before burning in air so that the layer of magnesium oxide (which is formed due to reaction of magnesiumwith air) can be removed in order to get the desired chemical reaction.

hope it helps!

Answer 2

HERE'S YOUR ANSWER
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A magnesium ribbon should be cleaned before burning in air because it may be covered with impurities and the oxide layer of magnesium. Since , the oxide layer generally form . So , for suitable reaction these layers must be removed and magnesium ribbon must be cleaned