Question

Rusting of iron cannot be prevented by which of the following methods?

• A. Reacting with non-metal
• B. Chrome plating
• C. Galvanizing
• D. All of the above

Answer 1

The correct option is D All of the above

In galvanizing, the metal is dipped in molten zinc which acts as a protective layer.
In chrome plating, a thin layer of chromium is electroplated on to the surface of the metal.

Alloying also prevents the metal from rusting.

Sodium readily reacts with oxygen in the air, the sodium layer when exposed to air reacts and exposes iron to the atmosphere. Hence, coating iron with sodium does not prevent rusting.