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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.

Related tags

ScienceClass 10Chemical ReactionsMagnesium RibbonOxidationOxide Layer

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