When magnesium ribbon burns in air to form magnesium oxide, it a _______ reaction.

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Solution

Combination reaction- A synthesis reaction or direct combination reaction is a type of chemical reaction in which two or more simple substances combine to form a more complex product.
Magnesium reacts with Oxygen gas to form solid Magnesium oxide.
$\underset{Magnesium}{2 Mg (s)} + \underset{Oxygen}{O_{2} (g)} \to \underset{Magnesium oxide}{2 MgO (s)}$
Hence, When magnesium ribbon burns in air to form magnesium oxide, it a combination reaction.

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