Question

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

Answer 1

magnesium ribbon be cleaned before burning in air because magnesium is considered as most reactive element in react with atmospheric gases and forms coating therefore to remove this coating within the clean the magnesium ribbon before burning in air

Answer 2

Hey mate

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

Magnesium ribbon must be cleaned before burning in air so that the 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.