Answer:
Aluminium metal is a powerful
reducing agent. It reduces the oxides of metals like iron and chromium to the
metallic state upon heating.
\[\underset{\text{Ferric}\,\,\text{oxide}}{\mathop{F{{e}_{2}}{{O}_{3}}(s)}}\,\,\,+2\,Al(s)\,\,\,\xrightarrow{{}}\,\underset{\text{Aluminium}\,\,\text{oxide}}{\mathop{A{{l}_{2}}{{O}_{3}}(s)+2Fe(l)}}\,\]
\[\underset{\text{Chromium}\,\text{oxide}}{\mathop{C{{r}_{2}}{{O}_{3}}(s)}}\,+2Al(s)\xrightarrow{\,}\,A{{l}_{2}}{{O}_{3}}(s)+2Cr(l)\]
The reaction is known as thermit
reaction. It is highly exothermic in nature. As a result, the metal iron or
chromium which is formed, is in the molten state. It can be used to fill the
cracks in the railway tracks and also the cracks in the machine parts. This
process is known as thermit process. For details consult section 6.16.
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