Question 1:
Why should a magnesium ribbon be cleaned before burning in air?
Answer
Magnesium is very reactive metal. When stored it reacts with oxygen to form a layer
magnesium oxide on its surface. This layer of magnesium oxide is quite stable and
prevents further reaction of magnesium with oxygen. The magnesium ribbon is
cleaned by sand paper to remove this layer so that the underlying metal can be
exposed into air.
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