Question

Why should a magnesium ribbon be cleaned before burning it in air?

Answer 1

to avoid the immediate white lightening of the mg ribbon so as to avoid burning and oxidation. it is a highly reactive metal .

Answer 2

♤ When Magnesium ribbon is exposed in the atmosphere it form a layer of magnesium oxide on its surface.

♤ This layer of magnesium oxide is stable compound to prevent further reaction of magnesium with oxygen.

♤ Hence, it should be cleaned before burning in air to remove this layer so that the metal can be exposed to air properly.