Question

Aluminothermy used for the spot welding of large iron structure is based on the fact that-

• A. reaction between iron and oxygen is endothermic
• B. as compared to to Al, Fe has greater affinity for oxygen
• C. as compared to iron, Al has great affinity for oxygen
• D. reaction between Al and oxygen is endothermic

Answer 1

The correct option is C as compared to iron, Al has great affinity for oxygen

Solution:- (C) as compared to iron, $Al$ has great affinity for oxygen

Since $Al$ is more electropositive and has greater affinity for oxygen than iron.

This fact has made the use of aluminothermy in welding of large iron structure.