Answers

2014-09-17T11:41:32+05:30
The magnesium ribbon which we usually use has a coating on white layer of magnesium oxide on its surface it is formed by the slow reaction of moist air on it these layer must be removed before burning
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2014-09-18T07:35:52+05:30
Magnesium ribbon reacts with oxygen in atmosphere to form magnesium oxide, which is a protective layer. The presence of this layer will result in ribbon burning very slowly. Hence, magnesium ribbon must be cleaned with a sand paper before burning.
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