Ahmad took a magnesium ribbon(cleaned) and burned it on a flame
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It is so because magnesium is a very very reactive metal and it reacts with oxygen present in the air and formula of magnesium oxide on the earth and the layer of magnesium oxide is highly stable so that it prevents of for the reaction of magnesium with oxygen and does so that is why it is necessary that the magnesium ribbon should be cleaned before burning it on the name or in the presence of oxygen so that the underlying methods can also be exposed to the air
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