Before burning in air the magnesium ribbon is cleaned by rubbing assignment paper to
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remove the oxide layer from the surface of magnesium ribbon
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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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