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  4. Copper is the most noble of the first row transition metals and occurs in smali deposits in several countries. Ores of copper include chalcanthite ( CuSO 4 ⋅ 5 H 2 O ), atacamite ( Cu 2 Cl ( OH )3), cuprite ( Cu 2 O ), copper glance ( Cu 2 S ) and malachite ( Cu 2( OH )2 CO 3). However, 80 % of the world copper production comes from the ore chalcopyrite ( CuFeS 2). The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction. Partial roasting of chalcopyrite produces (1) Cu 2 S and FeO (2) Cu 2 O and FeO (3) CuS and Fe 2 O 3 (4) Cu 2 O and Fe 2 O 3

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

IIT JEEIIT JEE 2010General Principles and Processes of Isolation of Elements

Solution:

$2CuFeS_2 + O_2\rightarrow Cu_2S + 2FeS+ SO_2\uparrow$
$2Cu_2S+3O_2\rightarrow 2Cu_2O + 2SO_2\uparrow$
$2FeS+3O_2\rightarrow 2FeO + 2SO_2\uparrow$