Question

Among.the metals Cr, Fe, Mn, Ti, Ba, and Mg, the one that cannot be obtained by reduction of its metal oxide by aluminium is :

• A. Cr
• B. Fe
• C. Mn
• D. Ba

Answer 1

The correct option is D Ba

Reduction by Al

This process is employed in the case of those metals which have very high melting points and are to be extracted from their oxides

For example:

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

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

However, $Ba$ cannot be obtained by this process.