Question

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

Answer 1

Magnesium is a reactive metal .When it comes in contact of air it forms a inert layer over its surface which prevent it from burning .So magnesium ribbon is cleaned before burning to remove that layer
_______ Hope it helps

Answer 2

Heya....^_^

Here's ur ans.⤵

Magnesium is a reactive element and reacs with Oxygen when kept in open .

↪ Therefore , to remove the layer of magnesium oxide we should clean the magnesium ribbon so that we can get the results from magnesium as a reactant instead of magnesium oxide.

✌◾Hope it helps ◾