Question

Why should we clean a magnesium ribbon before burning it in air

Answer 1

helloo...!!

Magnesium ribbon must be cleaned before burning in air so that the the layer of magnesium oxide which is formed due to reaction of magnesium with air
so, it needs cleaning before we use Magnesium...!!

hope this helps you

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.