Question

why should a magnesium ribbon be cleaned before burning in air class 10 CBSE solutions

Answer 1

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here is your answer

Magnesium is a very reactive metal when stored, it reacts with oxygen to form a layer of magnesium oxide on its surface. This layer of magnesium oxide is quitestable and prevents further reaction of magnesium with oxygen. The magnesium ribbon is cleaned by Sand paper for removing this layer so that the underlying metal can be exposed to air..

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Answer 2

Magnesium ribbon is cleaned before burning it in air in order to remove oxide layer, presence of which slowdowns the oxidation process. So, by cleaning it, the burning process takes place easily.