Question

why should magnesium ribbon should be cleaned before before burning in air​

Answer 1

Because it forms a thin layer of magnesium oxide when exposed to air or oxygen..

this layer is chemically unreactive and doesnt burn..

Hemce it must be cleaned be4 buring.

REACTION EQUATION IS=>
2Mg + O2 ==> 2MgO

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Answer 2

magnesium ribbon should be cleaned before burning in air to remove the magnesium oxide deposited over it.

Mg +O2----> 2 MgO

hope it helps...