Why does the iron pillar in Delhi does not rust although it is made by iron?
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because it is painted from a strong metal that cannot corrode..
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Iron pillar of Qutub Minar is not rusted because it was made by 98% wrought iron. ... A thin layer of a˜misawitea (formed catalytically by the presence of phosphorous in the iron), a compound of iron, oxygen and hydrogen, has also protected the pillar.
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