Question

Why should a magnesium ribbon be cleaned before burning in air

Answer 1

 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.

Answer 2

hey mate here is ur 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.
hope it help you
happy winter