Question

$Pb$ and $Sn$ are extracted from their chief ore galena and cassiterite by:

• A. Carbon reduction and self-reduction respectively
• B. Self-reduction and carbon reduction respectively
• C. Electrolysis and self-reduction respectively
• D. Self-reduction and self-reduction respectively

Answer 1

The correct option is B Self-reduction and carbon reduction respectively

Lead ($Pb$) is extracted by the self-reduction process from galena:
$2PbS+3O_2\to 2PbO+2S{O}_2$
$PbS+2PbO\to 3Pb+S{O}_2$

Tin ($Sn$) is extracted through carbon-reduction from cassiterite.
$Sn{O}_2+CO\to SnO+C{O}_2$
$SnO+CO\to Sn+C{O}_2$