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

Tinstone or cassiterite - $Sn{O}_2$ - is the principal ore of tin. It is subjected to gravity separation and once some
heavy impurities are removed, the magnetic impurities are removed by magnetic separation.
After a series of concentration processes, the concentrated ore obtained is called "Black tin".
This is a historical legacy name that has survived from the mining days in Devon and Cornwall (both in England).

Black tin is the raw ore of tin, usually concentrated/dressed cassiterite, which is sold by a tin mine to a smelting company.
contrast this with "white tin," which is the refined, metallic tin produced after smelting.

Black tin is smelted with anthracite coke and lime. Lead is subjected to self-reduction.