Which of the following are precise ways to prevent rusting of iron?

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Coating iron metal surface with paint.

Electroplating

All of the above.

Galvanization

answer is D.

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Detailed Solution

Coating iron metal surfaces with paint, galvanization and electroplating are all precise ways to prevent rusting of iron.
Basically, to prevent rusting of iron we need to protect the metallic surface in such a way that the metallic surface is not exposed to air, moisture or any chemical stains. So, applying a layer of paint can help protect the metallic surface. Galvanization is a method where zinc metal is coated on the surface of the iron. Zinc is a stronger reducing agent than iron and that means, zinc gets more easily oxidised as compared to iron. This suggests that, in case of contact with oxygen in the air, zinc will get oxidised and not iron. In this manner, the galvanization method prevents rusting. Plating metals like chromium on the surface of iron by the process of electroplating can also protect the metallic surface from corrosion.

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