write two essential conditions for rusting
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The presence of water and oxygen is essential for the rusting of iron. Impurities in the iron, the presence of water vapor, acids, salts, and carbon dioxide hasten to rust. Pure iron does not rust in dry and carbon dioxide free air.
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Rusting of iron takes place in the presence of moisture and air. So the presence of air and water vapour in air are two necessary conditions for rusting of iron.
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