Question -
When copper pyrite is roasted in excess of air, a mixture of Cu2S and FeO are formed. FeO is present as impurity. This can be removed as slag during Smelting. The flux added to form slag is
Options:
A .  Silica which is an acidic flux
B .  Limestone, which is a basic flux
C .  SiO2 which is a basic flux
D .  CaO which is a basic flux
Answer: Option A : A FeO (Basic gangue) impurity is mixed with SiO2 (acidic flux) to form a fusible slag FeO+SiO2→FeSiO3 (slag)
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