The Venn diagram describes a phase change from solid to gas phase between the areas marked A. B and C
B. A and C
C. A and B
D. None of these

Not a  mixture of two common elements that can be separated by physical means.

Answerchemical energy;

Remember that rust prevented by placing a sacrificial electrode in electrical contact with the iron. the sacrificial electrode must be composed of a metal that  oxidizes  more easily than iron (that is, it must be below iron in table 18.1).