Why should a magnesium ribbon be cleaned before burning ??
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A magnesium ribbon should be cleaned before burning to ensure that all the impurities (oxide layer) are rubbed out and ribbon will burn smoothly.
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Magnesium reacts with the oxygen in the air due to its high reactivity to form a layer of magnesium oxide which prevents the further reaction.this layer has to be cleaned for further reaction. therefore magnesium ribbon has to be cleaned
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