Which among iron and mercury is a better conductor of electricity?

Among iron and mercury, iron is a better conductor of electricity. In general, metals are good conductors of electricity due to the presence of free electrons that can move easily through the material when an electric field is applied. These free electrons are responsible for carrying the electric current.

Iron is a metal and has a relatively high electrical conductivity compared to many other materials, including mercury. Mercury, while also a metal, has a lower electrical conductivity than iron. It is not as good a conductor of electricity as many other metals due to its unique structure and properties.

Keep in mind that both iron and mercury conduct electricity to some extent, but iron is the superior conductor between the two.