Why should a magnesium ribbon becleaned before burning in air
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it should be cleaned thoroughly because it has a layer of magnesium carbonate over it which gives different results for magnesium and oxygen reaction
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Magnesium is a highly reactive metal. When exposed to air for a long time it gets coated with the layer of oxide which is physically and mentally stable and therefore, partly masks the reactivity of magnesium. The oxide coating does not burn when a flame is brought in contact with the metal. Therefore, the surface should be cleaned, with a sandpaper before burning the magnesium ribbon in air.
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