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लोहे पर जंग लगने की प्रक्रिया इस प्रकार ...

लोहे पर जंग लगने की प्रक्रिया इस प्रकार होती है
`2H^(+)+2e+1//2O_(2)toH_(2)O(l)," "E^(@)=+1.23` वोल्ट
`Fe^(2+)+2etoFe(s)," "E^(@)=-0.44` वोल्ट
परिणामी अभिक्रिया के लिए `DeltaG^(@)` का मान होगा :

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