A) the melting point of iron is low
B) the reaction is highly endothermic
C) large amount of heat is liberated in the formation of \[A{{l}_{2}}{{O}_{3}}\]
D) aluminium is an amphoteric element
Correct Answer: C
Solution :
Al has high affinity for oxygen, because \[A{{l}_{2}}{{O}_{3}}\] is highly stable compound, so Al reduces iron oxide to molten iron due to high \[\Delta H(-ve)\] value. (Thermite process for reduction of metal generates a lot of heat).
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