Question

In galvanisation, the coating of which metal is applied on iron to prevent it from rusting?

• A. Aluminium
• B. Sodium
• C. Zinc
• D. Copper

Answer 1

The correct option is C Zinc

Steel or iron objects that must withstand the weather are coated with a layer of zinc to prevent their rustin. This process is called galvanisation.

Theory:
Prevention of corrosion:
Protective coating (Sacrificial Protection):
By covering the material surface by other metals $Sn,Zn$ etc that are inert or react so as to save the material.

Protective Coating (Sacrificial Protection) of Iron:
The process involves covering of surface of iron object with a layer of more active metal. The active metal gets oxidised in preference to iron which in turn prevents rusting.