Question

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

Answer 1

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Magnesium ribbon be cleaned before burning in air because there is thin layer of oxide on the surface of magnesium which slows down the process of burning. That's why we rubbed it with sandpaper before burning

Answer 2

magnesium ribbon should be e clean before burning into air because magnesium is considered as one of the most reactive metal in the nature which reacts with atmospheric gases and forms oxide and carbonate layer therefore we should remove this layers because it prevents the burning