Why should a magnesium ribbon be cleaned before burning in
the air ?
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Answer:
Hint: Magnesium is a very reactive metal. When it is kept in the open air it can react with the gases present in the air. Cleaning will remove those impurities formed due to the reaction with air.
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Answer:
magnesium ribbon should be cleaned before burning in air because magnesium reacts with oxygen slowly to form magnesium oxide which prevents the burning of magnesium. The layer of magnesium oxide should be removed by sand paper.
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