Question

what happens when magnesium ribbon burnt in air

Answer 1

The property displayed in this demonstration uses magnesium metal to display what happens to metal when it reacts with oxygen gas, that is found in the air around us. Magnesium metal and its alloys are explosive hazards; they are highly flammable in their pure form when molten or in powder or in ribbon form. Burning or molten magnesium metal reacts violently with water. When working with powdered magnesium, safety glasses with welding eye protection are employed, because the bright white light produced by burning magnesium contains ultraviolet light that can permanently damage eyes.
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Answer 2

→2MgO

Magnesium ribbon burns with oxygen to produce magnesium oxide. Given reaction is an example of Combination reaction.