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Why is magnesium ribbon cleaned before burning?

Answer and explanation

Correct answer: To remove the magnesium oxide layer from its surface

On exposure to air, a thin layer of magnesium oxide forms on the surface of magnesium ribbon. This coating prevents direct contact between magnesium and oxygen. Cleaning the ribbon with sandpaper removes the oxide layer, so magnesium burns readily and forms magnesium oxide. Cleaning does not increase its melting point or produce oxygen.

Related tags

Class 10 ScienceChemical ReactionsMagnesium RibbonOxidationMetal Oxides

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