Question

Which of the following methods cannot be used to prevent corrosion of iron?

• A. Covering the surface by paint
• B. Covering the surface by zinc
• C. Allowing the surface to interact with moisture
• D. Allowing the surface to interact with air

Answer 1

Answer: (C), (D)

The correct options are
C

Allowing the surface to interact with moisture

D

Allowing the surface to interact with air

Corrosion can be prevented by preventing the surface of the metallic object to come in contact with the air and moisture.
Following are the methods to prevent the corrosion of iron:

• Covering the metallic surface by paint
• Applying the coating of zinc over the metallic surface
• Providing the sacrificial electrode of another metal like zinc and magnesium