Question

In the corrosion process by evolution of hydrogen
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Answer 1

Answer:

Evolution of Hydrogen Electrochemical corrosion with evolution of H2 occurs in acidic Environment At anode Fe →Fe2+ + 2e-(oxidation /corrosion) At cathode 2H+ + + 2e-→H2 Overall reaction Fe +2H+ →Fe Explanation (1) Iron tank which acts as an anode undergoes corrosion as Fe atoms from the tank pass into the acidic solution as Fe++ ions as shown in reaction above. Since nothing but loss of Fe atom as Fe++ ions i.e. corrosion. (2) Free electrons accumulate at cathode Hydrogen ions present in acidic solution take up these electrons forming H2 gas as shown in the reaction above. H2 gas liberates in the form of bubbles near the cathode. Thus, hydrogen evolution type of corrosion is nothing but displacement of H+ from acidic solution by metal ions.

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