Question

Iron pillar near QutabMinar in Delhi has got rusted till now due to the coating of

a. Fe2O3 on its surface b. FeO on its surface

c.FeCO3 on its surface d. Fe3O4 on its surface​

Answer 1

A. Fe2O3 on its surface

Fe2O3 is rust

Answer 2

Answer:

The pillar was manufactured by the forge welding of pieces of wrought iron. In a report published in the journal Current Science, R. Balasubramaniam of the IIT Kanpur explains how the pillar's resistance to corrosion is due to a passive protective film at the iron-rust interface. The presence of second-phase particles (slag and unreduced iron oxides) in the microstructure of the iron, that of high amounts of phosphorus in the metal, and the alternate wetting and drying existing under atmospheric conditions are the three main factors in the three-stage formation of that protective passive film.

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