Question

Aluminum metal is frequently used as a reducing agent for the extraction of metal such as chromium or manganese from their respective _______

• A. zinc
• B. oxides
• C. reduction
• D. none of these

Answer 1

The correct option is B oxides

Aluminium is more electropositive than Cr or Mn.
Hence, aluminum metal is frequently used as reducing agent for the extraction of metal such as chromium or manganese from their respective oxides.
The process of reduction is known as Aluminothermy. Thermite mixture $F{e}_2{O}_3+Al$ in 3:1 ratio is used.
$C{r}_2{O}_3+2Al\to A{l}_2{O}_3+2Cr$
$3M{n}_3{O}_4+8Al\to 4A{l}_2{O}_3+9Mn$