Aluminothermy used for the spot welding of large iron structures is based upon the…
CHEMISTRY · Single correct · CBSE · Chemistry · Metals and Non-metals · Metals and Non-metals
Problem
Aluminothermy used for the spot welding of large iron structures is based upon the fact that :
(1) As compared to iron, aluminium has greater affinity for oxygen
(2) As compared to aluminium, iron has greater affinity for oxygen
(3) Reaction between aluminium and oxygen is endothermic
(4) Reaction between iron oxide and aluminium is exothermic