Question

Alumino-thermic process is used for the extraction of metals whose oxides are :

• A. Fusible
• B. Not easily reduced by carbon
• C. Not easily reduced by hydrogen
• D. Strongly basic

Answer 1

The correct option is B Not easily reduced by carbon

Alumino thermite process: Certain Oxides of Mn, Cr do not reduce by carbon due to very high melting point. They are reduced by $Al$.

Examples:

$C{r}_2{O}_3+2Al\to 2Cr+A{l}_2{O}_3$

$3M{n}_3{O}_4+8Al\to 9Mn+4A{l}_2{O}_3$