NTA Abhyas NEET2020ChemistryGeneral Principles and Processes of Isolation of MetalsPractice
Why is partial roasting of sulphide ore done in metallurgy of copper?
Options
- AAuto reduction of CuO formed is carried out by remaining CuS in the reaction
- BCu is separated out by partial reduction due to sedimentation
- CDue to difference in gravity CuO and CuS are separated
- DComplete roasting cannot be done in one step hence partial roasting is done
Correct answer
A. Auto reduction of CuO formed is carried out by remaining CuS in the reaction
Step-by-step solution
Partial roasting of sulphide ore forms metal oxide. This oxide then reduces the remaining sulphide ore into metal. 2 C u 2 S + 3 O 2 → 2 C u 2 O + 2 S O 2 2 C u 2 O + C u 2 S → 6 C u + S O 2 This process is called autoreduction.