Question

why iron pillar in delhi was made more than 2000years ago it has not get rust why​

Answer 1

Hey mate ,

Scientists believe that they had developed a process which prevented wrought iron from rusting . This is likely because of formation of a thin film of magnetic oxide ( Fe3O4 )on its surface , and painting it with a mixture of different salts ..

Hope you find it helpful!!

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( Ncert class 10 pg.. 54 )

Answer 2

Answer:

Just like in galvanization, in which a zinc oxide layer protects the inner iron metal, the iron pillar in Delhi has an even layer of crystalline iron(III) hydrogen phosphate hydrate forming on the high-phosphorus-content iron, which protects it from corrosion and any other ill effects the climate may have on it.

Hope it helps :)