Discussion Forum



1)

The carbon-based reduction method is not used for extraction of 


A) tin from $SnO_{2}$

B) iron from $Fe_{2}O_{3}$

C) aluminium from $Al_{2}O_{3}$

D) magnesium from $MgCO_{3},CaCO_{3}$

Answer:

Option C,D

Explanation:

Al has a greater affinity for oxygen hence oxide is not reduced by carbon. MgO  and CaO (formed in the calcination from carbonates) are stable species and not reduced by carbon

During Smelting

 $SnO_{2}+C$     $\underrightarrow{1300^{0}C}$           $ Sn+CO$

$2Fe_{2}O_{3}+3C$      $\underrightarrow{\triangle}$  $4Fe+3CO_{2}$