Question

Rust is chemically called .

Answer 1

1. Corrosion of iron is known as rusting.
2. Iron (III) hydroxide readily breaks down to form hydrated iron(III) oxide, known as rust.

$$\begin{gathered} 4\mathrm{Fe}\left(\mathrm{s}\right)+3{\mathrm{O}}_2\left(\mathrm{g}\right)+2{\mathrm{xH}}_2\mathrm{O}\left(\mathrm{l}\right)\to 2{\mathrm{Fe}}_2{\mathrm{O}}_3.{\mathrm{xH}}_2\mathrm{O}\left(\mathrm{s}\right) \\ \mathrm{iron}\mathrm{oxygen}\mathrm{water}\mathrm{Rust} \end{gathered}$$

Hence, Rust is chemically called hydrated iron(III) oxide.