Question

Aluminium powder is used in thermite welding because :

• A. it is a strong reducing agent
• B. it is a strong oxidising agent
• C. it is corrosion resistant
• D. it is a good conductor of heat

Answer 1

The correct option is A it is a strong reducing agent

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 $F{e}_2{O}_3$ to iron. Reduced molten iron sinks and flows into the gap of the grinder thereby welding it.

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