strong{font-weight:bold !important} Chemically, rust is hydrated ferric oxide, a compound formed by the reaction of iron (Fe), water (H₂O), and oxygen (O₂). The process, known as corrosion, can be represented by the chemical formula:4Fe + 6H₂O + 3O₂ → 4Fe(OH)₃The compound Fe(OH)₃ further dehydrates to form hydrated ferric oxide, which is rust. The general formula for rust is:Fe₂O₃ · xH₂OHere, x represents the variable amount of water molecules in the compound.Key PointsChemically, rust is formed due to oxidation and hydration of iron.Rusting weakens iron by turning its surface into a brittle, flaky material.The reddish-brown appearance of rust is a characteristic of hydrated ferric oxide.Real-World ImplicationRust can cause significant structural damage to iron-based materials over time, which is why preventive measures like painting, galvanizing, or using rust-resistant alloys are essential.

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Chemically rust is

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Only ferric oxide

None of these

Hydrated ferric oxide

Hydrated ferrous oxide

answer is C.

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Detailed Solution

Chemically, rust is hydrated ferric oxide, a compound formed by the reaction of iron (Fe), water (H₂O), and oxygen (O₂). The process, known as corrosion, can be represented by the chemical formula:

4Fe + 6H₂O + 3O₂ → 4Fe(OH)₃

The compound Fe(OH)₃ further dehydrates to form hydrated ferric oxide, which is rust. The general formula for rust is:

Fe₂O₃ · xH₂O

Here, x represents the variable amount of water molecules in the compound.

Key Points

Chemically, rust is formed due to oxidation and hydration of iron.
Rusting weakens iron by turning its surface into a brittle, flaky material.
The reddish-brown appearance of rust is a characteristic of hydrated ferric oxide.

Real-World Implication

Rust can cause significant structural damage to iron-based materials over time, which is why preventive measures like painting, galvanizing, or using rust-resistant alloys are essential.

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