Question:
The wrong statement about corrosion is
The wrong statement about corrosion is
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Think of potential difference like a slope: the steeper the slope (greater the difference), the faster the "current" of corrosion flows.
Updated On: Jul 4, 2026
- Corrosion involves oxidation
- Hydrated ferric oxide is called rust
- Lesser the potential difference between the two metals, greater will be the corrosion of anodic metal
- Coating of zinc on iron is an example of anodic coating
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The Correct Option is C
Solution and Explanation
Step 1: Concept
Galvanic corrosion depends on the potential difference (EMF) between two dissimilar metals in contact.
Step 2: Meaning
Oxidation occurs at the anode, and the rate of this reaction is driven by the electrochemical potential gap.
Step 3: Analysis
Statements A, B, and D are factual: corrosion is an oxidative process, rust is hydrated iron oxide, and Zinc on iron is anodic (sacrificial). Statement C is false because a greater potential difference actually increases the corrosion rate.
Step 4: Conclusion
Therefore, statement C is the incorrect statement regarding the principles of corrosion. Final Answer: (C)
Galvanic corrosion depends on the potential difference (EMF) between two dissimilar metals in contact.
Step 2: Meaning
Oxidation occurs at the anode, and the rate of this reaction is driven by the electrochemical potential gap.
Step 3: Analysis
Statements A, B, and D are factual: corrosion is an oxidative process, rust is hydrated iron oxide, and Zinc on iron is anodic (sacrificial). Statement C is false because a greater potential difference actually increases the corrosion rate.
Step 4: Conclusion
Therefore, statement C is the incorrect statement regarding the principles of corrosion. Final Answer: (C)
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