Question

Complete the following

$2A{l}_2{O}_3+3C\to 4A+3B$. A & B are as follows.

• A. Al, CO
• B. CO, Al
• C. Al, CO₂
• D. CO₂,Al

Answer 1

The correct option is C

Al, CO₂

Alumina reacts with carbon or coke to form Aluminium and carbon dioxide.

$2A{l}_2{O}_3+3C\to 4Al+3C{O}_2$

This is not used to extract aluminium as the (very high) temperature makes the process economically unviable. Also, at such elevated temperatures (2000 ${}^{0}C$), aluminium could react with coke (carbon) to form aluminium carbide.