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Explain how rusting of iron is envisaged as setting up of an electrochemical cell.


3.15    Explain how rusting of iron is envisaged as setting up of a electrochemical cell.

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The chemistry of corrosion is quite complex but it can be understood by considering it as an electrochemical phenomenon. Consider a particular spot on an object where corrosion takes place. At here oxidation takes place and this spot behaves as the anode. The released electrons at anodic spot go through the metal and go to another spot on the metal and reduction of oxygen takes place in the presence of H+. This spot behaves as a cathode with the reaction. In this way this analogy is possible.

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