What is the correct reason for rubbing and cleaning a magnesium ribbon before burning it?
Answer and explanation
Correct answer: To remove the magnesium oxide layer from its surface
A thin layer of magnesium oxide forms on the surface of magnesium ribbon due to its reaction with oxygen in air. This layer prevents direct contact between magnesium and oxygen, so the ribbon does not burn readily. Rubbing removes the oxide layer and allows magnesium to burn easily. Increasing the mass is not the purpose of cleaning.
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What is the correct answer to this question?
To remove the magnesium oxide layer from its surface
Why is this the correct answer?
A thin layer of magnesium oxide forms on the surface of magnesium ribbon due to its reaction with oxygen in air. This layer prevents direct contact between magnesium and oxygen, so the ribbon does not burn readily. Rubbing removes the oxide layer and allows magnesium to burn easily. Increasing the mass is not the purpose of cleaning.
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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