Which of the following process(es) occur(s) during the extraction of copper from chalcopyrites?

Which of the following process(es) can given sulphur ?

Which processes occur during Interphase?

Minerals from which metals can be extracted economically and easily are called ores.The extraction of metals from theirs ores involves the following processes. (i)Concentration. (ii)Calcination | roasting | leaching . (iii)Reduction. It is carried out be one of the following methods. Which of the following reactions reactions does not occur in Bessemer converter in the extraction of copper from chalcopyrites ?

Which of the following is not added during the extraction of silver by cyanide process?