Question

Which of the following metals can not be extracted by carbon reduction process?

• A. $Pb$
• B. $Al$
• C. $Sn$
• D. $Zn$

Answer 1

Answer: (B)

$Al$

Oxides of strong electropositive metals such as $K,Ca,Na,Al$ and $Mg$ are very stable. It is difficult to reduce them into the metallic state by carbon reduction. Such metals are extracted by passing electricity through their fused chlorides/oxides/hydroxides.