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.
Frequently asked questions
What is the correct answer to this question?
Because its exothermic reaction with oxygen releases energy as heat and light.
Why is this the correct answer?
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.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
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