Question:
Rust is chemically
Rust is chemically
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Rusting requires both oxygen and water. If you keep iron in boiled distilled water (no oxygen) or in a vacuum (no water/oxygen), it will not rust.
Updated On: Jul 1, 2026
- Hydrated Ferric Oxide
- Hydrated Copper (II) Chloride
- Hydrated Ferrous Sulphate
- Hydrated Ferric Sulphate
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The Correct Option is A
Solution and Explanation
Rusting is the specific term used for the corrosion of iron in the presence of oxygen and moisture.
1. The Chemical Process:
When iron ($Fe$) is exposed to air and water, it undergoes a series of redox reactions. Initially, $Fe$ is oxidized to $Fe^{2+}$ ions, which are then further oxidized by oxygen to $Fe^{3+}$ ions.
2. Formation of Rust: These $Fe^{3+}$ ions react with water to form a reddish-brown flaky solid known as rust. Chemically, it is identified as a hydrated form of Iron (III) oxide.
3. Chemical Formula: The general formula for rust is represented as: $$Fe_2O_3 \cdot xH_2O$$ In systematic nomenclature, this is called
Hydrated Ferric Oxide.
2. Formation of Rust: These $Fe^{3+}$ ions react with water to form a reddish-brown flaky solid known as rust. Chemically, it is identified as a hydrated form of Iron (III) oxide.
3. Chemical Formula: The general formula for rust is represented as: $$Fe_2O_3 \cdot xH_2O$$ In systematic nomenclature, this is called
Hydrated Ferric Oxide.
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