Q. 154.5( 26 Votes )

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

Answer :

In the corrosion reaction, due to the presence of air and moisture, oxidation takes place at a particular point of an object made of iron. That spot behaves as the anode. The reaction at the anode is given by,


Fe(s) Fe2+ (aq) + 2e-


Electrons released at the anodic spot move through the metal and go to another spot of the object, wherein presence of H+ ions, the electrons reduce oxygen. This spot behaves as the cathode. These H+ ions come either from H2CO3, which are formed due to the dissolution of carbon dioxide from the air into water. The cathodic reaction is given by


O2(air) + 4H(aq)++4e- 2H2O


The overall reaction is given by,


2Fe(s) + O2(air) + 4H(aq)+ 2Fe2++2H2O


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