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Iron pillar near the Qutub Minar in Delh...

Iron pillar near the Qutub Minar in Delhi is famous for the following facts . Which of these facts is responsible for its long stability ?

A

It is more than 7 metres high .

B

It weighs about 6000 kg .

C

It was built more than 1600 years ago .

D

It has not rusted after such a long period .

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