Why should a magnesium ribbon be cleandd before burning in air ?
Magnesium is a very reactive metal and it. gets oxidised . The layer formed is magnesium oxide. So the layer has to be removed.
Magnesium ribbon get reacted with oxygen and forms A layer of oxide So its is cleaned before Use
Magnesium is a reactive metal. Hence,basic carbonate layer gets deposited over its surface because of the action of moisture and carbon dioxide by which it does not burn properly.Thus magnesium ribbon must be cleaned before burning in air...