Corrosion
Mediumchemistry
Rusting of iron in moist air is electrochemical because:
Select the correct option:
Solution
Incorrect! Answer:
Includes redox half-reactions
- Surface Cell: Tiny electrochemical cells form on the surface of iron where moisture and CO2/O2 are present.
- Anodic region: Fe(s)→Fe2+(aq)+2e−.
- Cathodic region: Electrons travel to another spot where Oxygen is reduced: O2+4H++4e−→2H2O.
- Circuit: The metal acts as a wire, and the water droplet acts as an electrolyte salt bridge.
- Completion: Subsequent oxidation of Fe2+ by oxygen leads to hydrated Iron(III) oxide (Rust).
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About This Question
- Subject
- chemistry
- Chapter
- electrochemistry
- Topic
- corrosion
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Includes redox half-reactions
- Surface Cell: Tiny electrochemical cells form on the surface of iron where moisture and CO2/O2 are present.
- Anodic region: Fe(s)→Fe2+(aq)+2e−.
- Cathodic region: Electrons travel to another spot where Oxygen is reduced: O2+4H++4e−→2H2O.
- Circuit: The metal acts as a wire, and the water droplet acts as an electrolyte salt bridge.
- Completion: Subsequent oxidation of Fe2+ by oxygen leads to hydrated Iron(III) oxide (Rust).
This medium difficulty chemistry question is from the chapter electrochemistry, covering the topic of corrosion. It appeared in the 2025 exam.
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