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

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It is more than 7m high

It weighs about 6000 kg

It was built more than 1600 years ago

It has no rust after such a long period

answer is D.

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Detailed Solution

Iron pillar has no rust after such a long period is responsible for its long stability.
An ironsmith built an iron pillar near the Qutub Minar in Mehrauli, Delhi, around 400 BC. This iron pillar is 8 metres tall and 6 tonnes in weight. The pillar is still in good condition and has not rusted after centuries. This demonstrates that our forefathers devised a way to keep things from rusting. Rusting is a chemical process in which there is a formation of a red or orange coat on the surface of the metals.

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