First slide

13th group or boron group

Question

In the thermite process, iron oxide is reduced to molten iron by Al powder because

Difficult

A

The melting point of Fe is low
B

The reaction is highly endothermic
C

Larger amount of heat is liberated in the formation of ${Al}_{2} O_{3}$
D

Al is an amphoteric element

Solution

The reduction of the metallic oxide with Al is known as the thermite process. Aluminium is used as a thermite mixture in thermite welding. Al powder is used as it is a strong reducing agent and it reduces Fe₂O₃ to iron. Reduced molten iron sinks and flows into the gap of the grinder thereby welding it.
Fe₂O₃ + 2Al → Al₂O₃ + 2Fe

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