Question

Partial roasting of chalcopyrite produces _______________.

• A. $C{u}_{2}S$ and FeO
• B. $C{u}_{2}O$ and FeO
• C. CuS and $F{e}_2{O}_3$
• D. $C{u}_{2}O$ and $F{e}_2{O}_3$

Answer 1

The correct option is B $C{u}_{2}O$ and FeO

Chalcopyrite ($CuFe{S}_2$)
Roasting is the process of heating the concentrated ore i.e. Sulphide ore of metals.
Partial roasting of Chalcopyrite follows given reaction:

$2CuFe{S}_2+O_2\to C{u}_{2}S+2FeS+S{O}_2\uparrow$

$2C{u}_{2}S+3O_2\to 2C{u}_{2}O+2S{O}_2\uparrow$

$2FeS+3O_2\to 2FeO+2S{O}_2\uparrow$

Thus partial roasting of chalcopyrite produces $C{u}_{2}O$ and $FeO$
Option B is correct.