A strip of magnesium ribbon is heated over a flame for a while. It is observed that the magnesium ribbon burns with a dazzling flame and turns into a white substance known as magnesium oxide. Which of the following equations correctly represents the described reaction?

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2Mg + 2O₂ → 2MgO

Mg + 2O₂ → 2MgO₂

2Mg + O₂→ 2MgO

Mg + O₂ → MgO₂

answer is C.

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Detailed Solution

When a metal is burnt in air, it reacts with oxygen to form oxides. In the given reaction, when magnesium is burnt in air, it combines with air to form magnesium oxide, MgO.

The equation given in this alternative correctly represents this reaction.
2Mg (s) + O₂(g) → 2MgO (s)
Magnesium Oxygen Magnesium oxide

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