CSWIP Cathodic Protection Personnel Practice Questions - CSWIP Cathodic Protection Personnel (BS EN ISO 15257) Exam

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Which cathodic reduction reaction predominantly occurs on a buried steel pipeline in aerated, neutral-pH soil environments?

Oxygen reduction: O2 + 2H2O + 4e- -> 4OH- Hydrogen evolution: 2H+ + 2e- -> H2 Metal dissolution: Fe -> Fe2+ + 2e- Water oxidation: 2H2O -> O2 + 4H+ + 4e-

Correct Answer:

Oxygen reduction: O2 + 2H2O + 4e- -> 4OH-

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