Question : Which of the following statements is correct?
Option 1: Zinc oxide is a form of rust.
Option 2: Copper can also turn into rust upon hydration.
Option 3: Chemically, rust is hydrated ferric oxide.
Option 4: Chemically, rust is a non-hydrated ferric oxide.
Correct Answer: Chemically, rust is hydrated ferric oxide.
Solution : The correct option is Chemically, rust is hydrated ferric oxide .
Rust is a common name for a very common compound, iron oxide. In the context of corrosion of iron or steel, rust is specifically hydrated ferric oxide, which is represented chemically as Fe 2 O 3 ·nH 2 O. The presence of water molecules in the chemical formula indicates that rust is formed through the reaction of iron, oxygen and water.
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