Question

Copper is the most noble of the first row transition metals and occurs in smali deposits in several countries. Ores of copper include chalcanthite $\left(CuS{O}_4\cdot 5H_{2}O\right)$, atacamite $\left(C{u}_{2}Cl(OH{)}_3\right)$, cuprite $\left(C{u}_{2}O\right)$, copper glance $\left(C{u}_{2}S\right)$ and malachite $\left(C{u}_2(OH{)}_{2}C{O}_3\right)$. However, $80\%$ of the world copper production comes from the ore chalcopyrite $\left(CuFe{S}_2\right)$. The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction.
Partial roasting of chalcopyrite produces
(1) $C{u}_{2}S$ and $FeO$
(2) $C{u}_{2}O$ and $FeO$
(3) $CuS$ and $F{e}_2{O}_3$
(4) $C{u}_{2}O$ and $F{e}_2{O}_3$

• 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

Answer: (B)

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