Question

The methods chiefly used for the extraction of lead and tin from their ores are respectively _________________.

• A. self reduction and carbon reduction
• B. self reduction and electrolytic reduction
• C. carbon reduction and self reduction
• D. cyanide process and carbon reduction

Answer 1

The correct option is A self reduction and carbon reduction

The methods chiefly used for the extraction of lead and tin from their ores are respectively self reduction and carbon reduction. Self reduction for lead is as follows.
$2PbS+3O_2\to 2PbO+2S{O}_2\uparrow$
$PbS+2O_2\to PbS{O}_4$
$2PbO+PbS\to 3Pb+S{O}_2\uparrow$
$PbS{O}_4+PbS\to 2Pb+2S{O}_2\uparrow$
Carbon reduction for tin is as follows.
$Sn{O}_2+2C\to Sn+2CO\uparrow$