Question

Why should a magnesium ribbon be cleaned before it is burnt in air?

Answer 1

$\huge \text{Hey mate}$

A magnesium ribbon should be cleaned before burning it in air because magnesium reacts with Oxygen slowly to form Magnesium Oxide. The layer of magnesium oxide should be removed by sand paper for a proper reaction.

Hope it will help you ❤❤

ʕ•ﻌ•ʔ

Answer 2

Question :-

Why should a magnesium ribbon be cleaned before it is burnt in air?

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.