Question

Which of these cannot be used to prevent rusting of iron?

• A. scrubbing
• B. Painting
• C. Galvanisation
• D. Oiling

Answer 1

The correct option is A scrubbing

• The rusting can be prevented by avoiding the direct contact of the iron surface with oxygen with water.
• Galvanisation is a method to prevent rusting by applying a layer of zinc over the iron surface.
• In oiling, a film of oil is applied on iron object to prevent it from rusting.
• Painting is a coating applied on the surface of objects. Painting shields the metal from coming in direct contact with air and moisture.
• Scrubbing is the process of cleaning a surface by rubbing it. Since scrubbing does not block the direct contact of an iron object with atmospheric air and water, therefore, it cannot be used to prevent rusting of iron.