Question
Silica is added to the sulphide ore of copper in reverberatory furnace because
A.
sulphide ore of copper contains iron as impurity which is removed as iron slag
B.
silica reacts with $$C{u_2}O$$ to form slag
C.
silica helps in reduction of $$C{u_2}O$$ to $$Cu$$
D.
sulphide ore of copper is separated from iron by reacting with silica.
Answer :
sulphide ore of copper contains iron as impurity which is removed as iron slag
Solution :
The impurities of iron present with copper are removed as iron silicate.
$$FeO + Si{O_2} \to \mathop {FeSi{O_3}}\limits_{{\text{Slag}}} $$