Question

Why should magnesium ribbon be cleaned before burning in air?​

Answer 1

Answer:

Magnesium ribbon should be cleaned with sandpaper before burning in the air. ... To remove the Magnesium oxide layer from the ribbon which may prevent or slow down the burning of magnesium ribbon. Unwanted impurities deposited on the magnesium ribbon can be removed and only pure magnesium can be used for the reaction.

Explanation:

pls mark my ans as the brainliest!!!!

Answer 2

Answer:

Magnesium is a reactive metal. When it is exposed to atmosphere for longer time, the oxygen  present in the atmosphere combines and MgO is formed on the metal surface. This oxide layer  does not burn in the flame so magnesium ribbon has to be cleaned with sandpaper before  burning in air.