Question

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

Answer 1

Answer:

Answer: Magnesium ribbon must be cleaned before burning in air so that the layer of magnesium oxide (which is formed due to reaction of magnesium with air) can be removed in order to get the desired chemical reaction.

Answer 2

Answer:

Hey dude,

Magnesium ribbon must be rubbed with sandpaper before burning in air because there is a layer of Magnesium oxide on the ribbon before heating it. It is important to get rid of that layer so that it doesn't slow down the reaction process.

Thanks! Hope this helps