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 $\mathrm { Cu } _ { 2 } \mathrm { O }$ to form slag
• C. Silica helps in reduction of $\mathrm { Cu } _ { 2 } \mathrm { O }$ to Cu
• D. Sulphide ore of copper is separated from iron by reacting with silica.

Answer 1

Answer: (A)

Sulphide ore of copper contains iron as impurity which is removed as iron slag

Answer 2

The impurities of iron present with copper are removed as iron silicate

$\mathrm { FeO } + \mathrm { SiO } _ { 2 } \rightarrow \underset { \text { Slag } } { \mathrm { FeSiO } _ { 3 } }$