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

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

JEE MainJEE Main 2023General Principles and Processes of Isolation of Elements

Solution:

$ CuFeS _2+ O _2 \xrightarrow{\text { Partial roasting }}$
$Cu _2 S + FeO + SO _2+\underset{\text { very small }}{ FeS }+ \underset{\text{very small}}{Cu _2 O} $
$ Cu _2 S + O _2 \rightarrow Cu _2 O + SO _2$
$FeS + O _2 \rightarrow FeO + SO _2 $
$ FeO + SiO _2 \rightarrow FeSiO _3$
No formation of calcium silicate $\left( CaSiO _3\right)$ in extraction of $Cu$.