Question

Extraction of metal from the ore cassiterite involves

• A. Carbon reduction of an oxide ore
• B. Self-reduction of a sulphide ore
• C. Removal of copper impurity
• D. Removal of iron impurity

Answer 1

Answer: (A)

The important ore of tin is cassiterite $\left(Sn{O}_2\right)$.
Tin is extracted from cassiterite ore by carbon reduction method in a blast furnace.
$Sn{O}_2+2C\to Sn+2CO$
The product often contain traces of iron which is removed by blowing air through the melt to oxidise to $FeO$ which then floats to the surface.
$2Fe+O_2\to 2FeO$