Question

Iron nails rust fast when used for fixing plates or strips of aluminium on a building. Similarly, a water pipe made of iron corrodes faster when connected to a pipe of copper. This happens because of the?

• A. Greater wetting of iron
• B. Easier flow of electrons to iron
• C. Higher rusting power of iron
• D. Chemical reduction of iron

Answer 1

The correct option is C Higher rusting power of iron

This is due to higher rusting power of iron.

When iron pipe is connected to copper corrosion is caused by self induced current created. The current is generated due to difference in electrical potential. The water act as a weak electrolyte.