Question

why should a magnesium ribbon be cleaned before burning in air

Answer 1

Hlo Bro ❤

It Is Because To remove the Protective Layer So ,It may readly combine with Oxygen.

Hope It helps ☺

Answer 2

aloha user!!

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magnesium ribbon reacts with oxygen present
in air to form MgO which is not reactive in nature.
hence the magnesium ribbon needs to be cleaned before burning.

2Mg + O2 ==> 2MgO

=> It gives a white dazzling flame when burned.

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hope it helps :^)