Question

Question 2. Magnesium ribbon is rubbed before burning because it has a coating of
(a) basic magnesium carbonate
(b) basic magnesium oxide
(c) basic magnesium sulphide
(d) basic magnesium chloride​

Answer 1

Answer:

Magnesium ribbon is rubbed before burning because it has a coating of basic magnesium carbonate.

Answer 2

Magnesium ribbon is rubbed before burning because it has a coating of basic magnesium oxide. (Option b)

• Magnesium is a more reactive metal, when it is shared in the atmospheric air it forms a layer of magnesium oxide.
• Further reaction of magnesium with oxygen that's when magnesium ribbon is cleaned by sandpaper to remove this layer.
• If this magnesium oxide is left for a long period then it forms a layer of magnesium carbonate.
• Due to the air of magnesium getting oxidized, it's rubbed so that it burns efficiently.