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

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

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