. Corrosion is essentially an electrochemical phenomenon


Corrosion is essentially an electrochemical phenomenon. With the help of a diagram explain the reactions occurring during the corrosion of iron kept in open atmosphere

                                                                                                                OR

Define the term molar conductivity and indicate how molar conductivity of a substance changes with change in concentration of a weak electrolyte and a strong electrolyte in its solution

Best Answer

At anode : Oxidation of Fe atoms takes place

electrochemical phenomenon

At cathode : Reduction of oxygen in the presence of H + ions. The H + ions are produced by either H2O or H2CO3 (formed by dissolution of CO2 in moisture)

                       diagram

diagram

The ferrous ions are further oxidised by atmospheric oxygen to ferric ions which come out as rust in the form of hydrated ferric oxide (Fe2O3 . xH2O)

Molar Conductivity Molar Conductivity It may be defined as the conductance of a solution containing 1 mole of electrolyte such that the entire solution is placed is between two electrodes one centimeter apart

Molar conductivit

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