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A student says that carbon dioxide extinguishes fire, so pouring CO₂ over a burning magnesium ribbon will put it out. Why is this statement incorrect?

Answer and explanation

Correct answer: Magnesium reacts with CO₂ to form MgO and carbon, so it may continue burning

Carbon dioxide normally suppresses fire by reducing contact between fuel and oxygen, but burning magnesium is an important exception. At high temperature magnesium removes oxygen from carbon dioxide: 2Mg + CO₂ → 2MgO + C. The reaction supplies magnesium with oxygen and produces carbon, so the ribbon can continue burning. CO₂ is not combustible, and it does not simply decompose into oxygen.

Related tags

ScienceClass10MagnesiumCarbon DioxideRedox ReactionFire SafetyChemical Reactions And EquationsChemical Substances – Nature And Behaviour

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