Question

A fresh piece of Mg ribbon loses its lustre after a few days.This is due to the formation of the compound_________.​

Answer 1

Answer:

Magnesium oxide on it in open Magnesium react with oxygen and form Magnesium oxide which allow Mg ribbon loses its lustre after a few days.

Answer 2

Magnesium Oxide forms a protective layer on the Mg ribbon which prevents it from burning as well as hides the lustte of the ribbon... When scraped the lustte returns and it can burn easily