Answer :

The impure iron surface behaves like small electrochemical cell in the presence of water containing dissolved oxygen or carbon dioxide. In this cell pure iron acts as an anode and impure iron surface acts as cathode. Moisture having dissolved CO2 or O2 acts as an electrolyte.


The reactions at cathode and anode are as follows:


Anode: 2Fe (s) 2Fe2+ + 4e-


Cathode: O2(g) + 4H+ (aq) + 4e- 2H2O (l)


Overall Reaction: 2Fe (s) + O2(g) + 4H+ (aq) 2H2O (l)


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :

Explain how rustiNCERT - Chemistry Part-I