Question

The chemical composition of rust is ______.

Options

• Fe₂O₃.xH₂O

• Fe₃O₄.xH₂O

• FeO.xH₂O

• Fe₃O₄

Answer 1

The chemical composition of rust is Fe₂O₃.xH₂O.

Explanation:

Rust is formed when iron reacts with oxygen and water (moist air). It is a hydrated form of ferric oxide. Its chemical formula is written as Fe₂O₃.xH₂O. This shows that rust contains iron(III) oxide and water molecules (xH₂O).