Question

Which metal is used in thermite process?

• A. Carbon
• B. Cobalt
• C. Aluminum
• D. Sodium

Answer 1

The correct option is C Aluminum

Aluminum is used in thermite process. The reaction is as follows:

$F{e}_2{O}_3$(s) + $2Al$(s) $\to$ $2Fe$(l) +$A{l}_2{O}_3$(s) +$Heat$

This displacement reaction is highly exothermic. The amount of heat evolved is so large that the metal is produced in the molten state. In fact, the reaction of iron(III) oxide with aluminium is used to join railway tracks or cracked machine parts. This reaction is known as the thermite reaction.