Final answer:
Magnesium nitrate (Mg(NO₃)₂) is not a product from magnesium ribbon combustion in air; the main product is magnesium oxide (MgO), and magnesium nitrate would require a different set of reactive conditions.
Step-by-step explanation:
The product that is not formed from the combustion of magnesium (Mg) ribbon in air is magnesium nitrate (Mg(NO₃)₂). When magnesium is burnt in air, it primarily reacts with oxygen to form magnesium oxide (MgO), as indicated by the chemical equation 2Mg (s) + O₂(g) → 2MgO (s). Magnesium hydroxide (Mg(OH)₂) is not directly formed during the combustion but can form when magnesium oxide reacts with water present in the air. Magnesium carbonate (MgCO₃) could potentially be formed if magnesium oxide reacts with carbon dioxide in the air, but this is less likely to occur under typical conditions of magnesium ribbon combustion. Therefore, the choice magnesium nitrate, which would require a direct reaction with a nitrogen source at high temperatures, is not a typical product of this combustion.