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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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Answer» (d) It has not rusted after such a long period |
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