Isolation of Elements

Question

Extraction of copper by smelting uses silica as an additive to remove :

Accepted Answer

Option B. The gangue material in the ore is removed by adding
another chemical substance called flux. If ore has basic
impurities, such as FeO, CaO, MgO, etc. suitable acid
flux such as SiO₂
, P₂O₅
, etc. are used. For example, in the
extraction of copper, ferrous oxide (FeO), a basic impurity, is removed by adding silica. FeO (gangue) and SiO₂
(flux) together form slag FeSiO₃.

More on Isolation of Elements

Isolation of Elements

More on Isolation of Elements