Question

y should be amgnesium ribbon cleansed before burining it?​

Answer 1

$\color{Red}{Heya}$

➡A magneium ribbin is cleaned before the protective layer of magnesium oxide from its surface so thay it may readily combine with the oxygen of air(on heating)

✌✌HOPE THIS HELPS✌✌

Answer 2

hey mate , here's your answer.....

A magnesium ribbon should be thoroughly cleaned before burning to remove the oxide layer (magnesium oxide) (MgO) and other impurities from its surface.

•EXTRA INFORMATION:-

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*Impurities obstruct the proper combustion of substance.

* A magnesium ribbon when burnt in air, burns with a dazzling white light.

......hope this helps......