why should magnesium ribbon be cleaned before use?
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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
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Magnesium ribbon is rubbed with a sandpaper to remove the upper layer of magnesium. Magnesium is a reative metal and hence must have easily reacted with oxygen to form magnesium oxide. By rubbing out this MgO it will be a proper practical
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