Question:
Identify the incorrect statement about the corrosion.
Identify the incorrect statement about the corrosion.
Show Hint
Corrosion is most severe when the anodic area is small and the cathodic area is large.
Updated On: May 7, 2026
- In the composition type of galvanic cell, metal with lower standard reduction potential undergoes corrosion
- In stress cell type of galvanic cell, corrosion occurs at the stressed area of the metal
- The rate of corrosion is more, when the area of cathode is smaller
- In concentration cell type of galvanic cell, the metal below the water level undergoes corrosion readily
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The Correct Option is C
Solution and Explanation
Concept:
Corrosion is an electrochemical process. The relative areas of anode and cathode strongly affect the rate of corrosion.
Step 1: In galvanic corrosion, the metal with lower reduction potential behaves as anode and undergoes oxidation.
So statement (A) is correct.
Step 2: In stress corrosion, the stressed portion acts as anode and corrodes faster.
So statement (B) is correct.
Step 3: In concentration cell corrosion, the region with less oxygen generally acts as anode and undergoes corrosion.
The portion below water level may corrode readily due to oxygen concentration difference.
So statement (D) is correct.
Step 4: Corrosion is more severe when a small anodic area is connected to a large cathodic area.
If cathode area is smaller, corrosion rate does not become more. Therefore, the incorrect statement is: \[ \boxed{\text{The rate of corrosion is more, when the area of cathode is smaller}} \]
Step 1: In galvanic corrosion, the metal with lower reduction potential behaves as anode and undergoes oxidation.
So statement (A) is correct.
Step 2: In stress corrosion, the stressed portion acts as anode and corrodes faster.
So statement (B) is correct.
Step 3: In concentration cell corrosion, the region with less oxygen generally acts as anode and undergoes corrosion.
The portion below water level may corrode readily due to oxygen concentration difference.
So statement (D) is correct.
Step 4: Corrosion is more severe when a small anodic area is connected to a large cathodic area.
If cathode area is smaller, corrosion rate does not become more. Therefore, the incorrect statement is: \[ \boxed{\text{The rate of corrosion is more, when the area of cathode is smaller}} \]
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