MCQ
Corrosion is a/ an:
- APhysical change.
- BNeutralisation reaction.
- ✓Electrochemical change.
- DNone of the above.
✓
Answer
Correct option: C.
Electrochemical change.
Hint: Corrosion is the oxidation of metal by moist air, often unwanted.
Corrosion is an electrochemical change. A highly reactive metal $($easily oxidisable$)$ is oxidised in the anodic reaction $M^{\mathrm{x}+}+\mathrm{xe}^{-} \rightarrow \mathrm{M}$. Highly reactive metals are more easily corroded unless they form a protective oxide layer around them on oxidation which prevents further oxidation. Noble metals like Pt are not easily corroded.
Corrosion is an electrochemical change. A highly reactive metal $($easily oxidisable$)$ is oxidised in the anodic reaction $M^{\mathrm{x}+}+\mathrm{xe}^{-} \rightarrow \mathrm{M}$. Highly reactive metals are more easily corroded unless they form a protective oxide layer around them on oxidation which prevents further oxidation. Noble metals like Pt are not easily corroded.
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