What is the scientific reason for cleaning a magnesium ribbon before burning it?
Answer and explanation
Correct answer: To remove the oxide layer formed on its surface
Magnesium reacts with oxygen in air to form a thin layer of magnesium oxide on its surface. This layer hinders direct contact between magnesium and oxygen, so the ribbon does not burn readily. Rubbing the ribbon removes this layer, allowing magnesium to burn with a dazzling white flame. This is different from removing magnesium oxide formed after burning.
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What is the correct answer to this question?
To remove the oxide layer formed on its surface
Why is this the correct answer?
Magnesium reacts with oxygen in air to form a thin layer of magnesium oxide on its surface. This layer hinders direct contact between magnesium and oxygen, so the ribbon does not burn readily. Rubbing the ribbon removes this layer, allowing magnesium to burn with a dazzling white flame. This is different from removing magnesium oxide formed after burning.
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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