Question

why should a magnesium ribbon be cleaned before burning in air?​

Answer 1

Magnesium is a very reactive metal so it reacts with oxygen to form a layer of magnesium oxide on its surface.

This layer is stable oxide so it prevents further reaction of magnesium with oxygen. To remove this layer a magnesium ribbon is cleaned using sandpaper before burning in air.

Answer 2

Answer:

Magnesium ribbon is cleaned with the Sand paper before burning in air, because We have to remove the protective layer of magnesium oxide with the sand paper from the magnesium ribbon.

After removing that layer it is easy to burn ribbon.

Hope it helps you...

Thanks..