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Question

Why the Iron pillar in Delhi do not get rusted?

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Solution

Iron pillar of delhi doesn't rust due to the following reasons

(i) the purity of its iron;

(ii) high phosphorus;

(iii) low sulphur;

(iv) absence of any other metal;

(v) cinder coating formed on the surface

; (vi) better forge welding;

(vii) drier and uncontaminated atmospheric condition; and

(viii) mass metal effect


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