Question

$Pb$ and $Sn$ are extracted from their chief ore 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 electrolysis respectively

Answer 1

Answer: (B)

self reduction and carbon reduction respectively

$2PbS+3O_2\to 2PbO+2S{O}_2$

$PbS+2PbO\to 3Pb+S{O}_2$ (self reduction)

$Sn{O}_2+C\to Sn+CO$ (carbon-reduction)

$Sn{O}_2+2CO\to Sn+2C{O}_2$

Option B is correct.