Question

Which one of the following reactions does not occur during extraction of copper?

• A. $CaO + SiO _2 \rightarrow CaSiO _3$
• B. $2 Cu _2 S +3 O _2 \rightarrow 2 Cu _2 O +2 SO _2$
• C. $FeO + SiO _2 \rightarrow FeSiO _3$
• D. $2 FeS +3 O _2 \rightarrow 2 FeO +2 SO _2$

Answer 1

Answer: (A)

$CaO + SiO _2 \rightarrow CaSiO _3$

Answer 2

CuFeS2?+O2?�Partial�roasting�?
Cu2?S+FeO+SO2?+�very�small�FeS?+very�smallCu2?O?
Cu2?S+O2??Cu2?O+SO2?
FeS+O2??FeO+SO2?
FeO+SiO2??FeSiO3?
No formation of calcium silicate (CaSiO3?) in extraction of Cu.