Question

What is rust known as chemically?

Answer 1

• Corrosion of iron is known as rusting. It is a slow oxidation process of iron in the presence of air and moisture.
• Rust is chemically known as hydrated iron(III) oxide, $\left({\mathrm{Fe}}_2{\mathrm{O}}_3.{\mathrm{H}}_2\mathrm{O}\right).$

Rusting of iron:

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

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