The process of corrosion is a redox reaction. Consider the rusting of the ... ...

The process of corrosion is a redox reaction. Consider the rusting of the body panel of automobiles. Certain parts of the object that are undergoing corrosion act as if they were half cells. For the corrosion of iron, iron is changed to Fe2+ ions. Which of the following best represents the area where this change occurs?  
(A) Cathode
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in 12. Electrochemistry