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Why is a magnesium ribbon rubbed with sandpaper before burning it?

Answer and explanation

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

On exposure to air, magnesium ribbon develops a thin layer of magnesium oxide on its surface. This layer prevents direct contact between the metal and oxygen and hinders burning. Rubbing with sandpaper removes the layer and exposes fresh magnesium for combustion. It does not lower the ribbon’s melting point.

Related tags

Chemical ReactionsMagnesium RibbonOxidationMetal OxideCombustion

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