Extraction of Metals - Result Question 51
Passage
Copper is the most noble of the first row transition metals and occurs in small deposits in several countries. Ores of copper include chalcanthite $\left(\mathrm{CuSO}_4 \cdot 5 \mathrm{H}_2 \mathrm{O}\right)$, atacamite $\left(\mathrm{Cu} _2 \mathrm{Cl}(\mathrm{OH})_3\right)$, cuprite $\left(\mathrm{Cu}_2 \mathrm{O}\right)$, copper glance $\left(\mathrm{Cu}_2 \mathrm{~S}\right)$ and malachite $\left(\mathrm{Cu}_2(\mathrm{OH})_2 \mathrm{CO}_3\right)$. However, $80 %$ of the world copper production comes from the ore chalcopyrite $\left(\mathrm{CuFeS}_2\right)$. The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction.
(2010)
51. Partial roasting of chalcopyrite produces
(a) $Cu _2 S$ and $FeO$
(b) $Cu _2 O$ and $FeO$
(c) $CuS$ and $Fe _2 O _3$
(d) $Cu _2 O$ and $Fe _2 O _3$
Show Answer
Answer:
Correct Answer: 51. (b)
Solution:
- $2 CuFeS _2+O _2 \longrightarrow Cu _2 S+2 FeS+SO _2 \uparrow$
$2 Cu _2 S+3 O _2 \longrightarrow 2 Cu _2 O+2 SO _2 \uparrow$
$2 FeS+3 O _2 \longrightarrow 2 FeO+2 SO _2 \uparrow$
BETA
