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Why should a magnesium ribbon be cleaned before burning in the air?
Magnesium ribbon must be cleaned before burning in the air for the following reasons-
1. Magnesium is a highly reactive element that rapidly reacts with oxygen in the air to form a white layer of magnesium oxide and this layer will not burn.
2.The layer of magnesium oxide (which is formed due to the reaction of magnesium with air) should be removed in order to get the desired chemical reaction.
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