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Why does a magnesium ribbon emit a dazzling white light when it burns?

Answer and explanation

Correct answer: Because its exothermic reaction with oxygen releases energy as heat and light.

Magnesium reacts vigorously with oxygen in an exothermic reaction: \(2Mg + O_2 \rightarrow 2MgO\). Energy is released as heat and dazzling white light, and white magnesium oxide powder is formed. Unlike option C, the light is not due to magnesium oxide glowing on its own; it is due to energy released during the reaction.

Related tags

Class 10 ScienceChemical ReactionsMagnesium BurningExothermic ReactionMagnesium Oxide

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