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GK QUESTION#3374

Which of the following statements is correct?

  1. AZinc oxide is a form of rust
  2. BChemically rust is hydrated ferric oxideCorrect answer
  3. CChemically rust is non-hydrated ferric oxide
  4. DCopper can also turn into rust upon hydration
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Answer

B. Chemically rust is hydrated ferric oxide

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Explanation

Rust is conventionally described as hydrated iron(III) oxide, often represented as Fe₂O₃·xH₂O. Actual rust can contain several hydrated oxides and oxyhydroxides rather than one fixed-composition compound. Zinc oxide and the corrosion products of copper are not called iron rust, and water participates in the corrosion process.

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