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

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

A
${Cu}_{2} O$
B
FeS
C
FeO
D
${Cu}_{2} S$

Solution:

Hence, option C is correct.
Correct option is C).

FeO is gangue and ${SiO}_{2}$ is flux to form slag ${FeSiO}_{3}$ .

$\underset{basic impurity}{FeO} + \underset{acidic flux}{{SiO}_{2}} ⟶ \underset{slag}{⟶} {FeSiO}_{3}$

Hence, the correct option is C.

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