Question

Give reason magnesium ribbon is to be cleaned before burning in air

Answer 1

the magnesium ribbon is quite reactive element .it Pp reacts with atmospheric oxygen to produce a layer of magnesium oxide which prevent it from Burning. hence, we have to clean it with the Sandpaper to remove it.

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.