Question

$\underset{\left(\mathrm{Iron}\right)}{4\mathrm{Fe}\left(\mathrm{s}\right)}+\underset{\left(\mathrm{Oxygen}\right)}{3{\mathrm{O}}_2\left(\mathrm{g}\right)}\to \underset{(\mathrm{Iron}\mathrm{oxide})}{2{\mathrm{Fe}}_2{\mathrm{O}}_3\left(\mathrm{s}\right)}$. The above reaction takes place in the presence of ______________.

Answer 1

$\underset{\left(\mathrm{Iron}\right)}{4\mathrm{Fe}\left(\mathrm{s}\right)}+\underset{\left(\mathrm{Oxygen}\right)}{3{\mathrm{O}}_2\left(\mathrm{g}\right)}\stackrel{\mathrm{x}.{\mathrm{H}}_2\mathrm{O}}{\to }\underset{\underset{\mathrm{Rusting}\mathrm{of}\mathrm{iron}}{(\mathrm{Iron}\mathrm{oxide})}}{2{\mathrm{Fe}}_2{\mathrm{O}}_3.{\mathrm{xH}}_2\mathrm{O}\left(\mathrm{s}\right)}$

The above reaction represents the chemical process of rusting or iron.

Rusting refers to the accumulation of rust on the surface of iron material which is a mixture of iron oxides.

In the reaction, iron is oxidized to $+3$ oxidation state in iron (III)

Hence, the above reaction takes place in the presence of moisture (Water molecule).