Question

why should magnesium ribbon be rubbed before burning in air

Answer 1

Heya!!Here is your answer friend ⤵⤵
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⏪Magnesium Ribbon Has a layer of Oxide on its surface . This later hinders the burning process .

⏪Hence , the Magnesium ribbon is rubbed with a Sand paper to remove this layer .

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Hope it helps you ✌✌#

Answer 2

Magnesium [Mg]ribbon should rubbed before burning in air because the oxygen in the air creates a layer on the ribbon thus stopping it from burning properly.So,it is rubbed with sand paper to remove the layer.

Mg+O2====>MgO