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Copper is most noble of the first row tr...

Copper is most noble of the first row transition metals and occurs in small deposits in several countries.Ores of copper include chalcanthite `(CuSO_4,5H_2O)` atacamite `(Cu_2Cl(OH)_3)`, cuprite `(Cu_2O)`, copper glance `(Cu_2S)` and malachite `(Cu_2(OH)_3CO_3)`. However, 80% of the world copper production comes from chalcopyrite `(CuFeS_2)`. The extraction fo copper from chalcopyrite involves partial roasting, removal of iron and self reduction.
In self reduction , the reducing agent is

A

S

B

`O^(-2)`

C

`S^(2-)`

D

`SO_(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
`Cu_2S + 2Cu_2O rarr 6Cu + SO_2 uarr`
Here the oxidation number of sulphur `(S^(2-))` changes to `(S^(4-))` so `S^(2-)` is the reducing agent.
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