Answer:
Partial roasting of sulphide ore is
carried in order to convert it to the oxide form. The oxide form then reduces
the remaining sulphide ore to the metallic form. This is called auto reduction.
\[2CuS+3{{O}_{2}}\xrightarrow{\,}\,2CuO+2S{{O}_{2}}\]
\[2CuO+CuS\xrightarrow{\,}\,3Cu+S{{O}_{2}}\]
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