Corrosion
Rusting of iron in moist air is electrochemical because:
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More electrochemistry Practice Questions
Rusting of iron is electrochemical in nature; which region of an iron surface in contact with water ...
Rusting of iron is electrochemical in nature; which region of an iron surface in contact with water ...
Rusting of iron is an example of:
Rusting of iron is an example of:
During discharge of a lead storage battery, both electrodes are converted to:
During discharge of a lead storage battery, both electrodes are converted to:
Nernst equation relates electrode potential to:
Nernst equation relates electrode potential to:
Relationship between standard cell potential and Gibbs free energy: ΔG° =
Relationship between standard cell potential and Gibbs free energy: ΔG° =
In an electrolytic cell (as opposed to galvanic), the anode is:
In an electrolytic cell (as opposed to galvanic), the anode is:
Faraday's first law states mass deposited is proportional to:
Faraday's first law states mass deposited is proportional to:
How many faradays required to deposit 1.0 mol of Al (Al³⁺ + 3e⁻ → Al)?
How many faradays required to deposit 1.0 mol of Al (Al³⁺ + 3e⁻ → Al)?
In a concentration cell with identical electrodes, driving force arises from:
In a concentration cell with identical electrodes, driving force arises from:
For cell: Zn(s)|Zn²⁺(1 M)||Cu²⁺(1 M)|Cu(s), E°(Zn²⁺/Zn) = -0.76 V, E°(Cu²⁺/Cu) = +0.34 V. E°cell is:
For cell: Zn(s)|Zn²⁺(1 M)||Cu²⁺(1 M)|Cu(s), E°(Zn²⁺/Zn) = -0.76 V, E°(Cu²⁺/Cu) = +0.34 V. E°cell is:
Metal higher in electrochemical series (more negative E°) tends to:
Metal higher in electrochemical series (more negative E°) tends to:
According to Faraday's second law, masses of different substances liberated by same charge are propo...
According to Faraday's second law, masses of different substances liberated by same charge are propo...
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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