Extraction of Metals - Result Question 46
####46. Extraction of metal from the ore cassiterite involves
(2011)
(a) carbon reduction of an oxide ore
(b) self-reduction of a sulphide ore
(c) removal of copper impurity
(d) removal of iron impurity
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Solution:
- The important ore of tin is cassiterite $\left(SnO _2\right)$. Tin is extracted from cassiterite ore by carbon reduction method in a blast furnace.
$$ SnO _2+2 C \longrightarrow Sn+2 CO $$
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.
$$ 2 Fe+O _2 \longrightarrow 2 FeO $$
