Question

Give one word or a phrase for the following.

Reddish-brown coloured hydrated oxide of iron formed during rusting.

Answer 1

Reddish-brown coloured hydrated oxide of iron formed during rusting is called Rust.

Rusting - the reaction of iron with oxygen and moisture in air resulting in the formation of reddish-brown coloured hydrated iron oxide(rust) is called rusting.

$\mathrm{Iron}\left(\mathrm{s}\right)+\mathrm{Oxygen}\left(\mathrm{g}\right)+\mathrm{Water}\mathrm{vapour}\left(\mathrm{g}\right)\to \mathrm{Hydrated}\mathrm{iron}\mathrm{oxide}\left(\mathrm{s}\right)$

The rusting of iron damages iron articles and hence should be prevented.