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Which of the following is/are the common electrochemical reactions that occur during corrosion?(a) M==>M^++ne(b) 2H^++2e=>H2(c) O2+4H^++4e==>H2O(d) M==>M^++ne, 2H^++2e=>H2 and O2+4H^++4e==>H2OI got this question during an interview.My question comes from Cathodic and Anodic Protection topic in portion Corrosion Prevention of Corrosion Engineering

Answer»

Correct ANSWER is (d) M==>M^++ne, 2H^++2e=>H2 and O2+4H^++4e==>H2O

Easiest explanation: The common electrochemical reactions that occur during corrosion are:

M==>M^++ne (METALLIC reduction or anodic reaction)

2H^++2e=>H2 (HYDROGEN evolution or cathodic reaction)

O2+4H^++4e==>H2O (oxygen reduction or cathodic reaction)


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