The powdery ash produced when a magnesium ribbon is burnt in the air, is mainly composed of .

magnesium oxide

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magnesium hydride

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magnesium nitride

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Solution

The correct option is A magnesium oxide
A magnesium ribbon burns in the air with a dazzling white light, leaving behind a powdery ash mainly composed of magnesium oxide. The reaction that takes place is represented as:

Magnesium ( $Mg$ ) + Oxygen ${(O}_{2})$ $\to$ Magnesium oxide ( $MgO$ )

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