Iron pillar near 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 7m in weight .
b) It weighs around 6000 kg .
c) It was built more than 1600 years ago.
d) It has not rusted after such a long time.
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D it has never rusted till now and was made by using technology no one knows that how it was Made it is rust free iron
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