Question

Copper is the most noble of the first row transition metals and occurs in small deposits in several countries. Ores of copper include chalcanthite

(CuSO_{4} \cdot 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

(A) $Cu_{2} S$ and FeO✓ Correct
(B) $Cu_{2} O$ and FeO
(C)CuS and $Fe_{2} O_{3}$
(D) $Cu_{2} O$ and $Fe_{2} O_{3}$

Answer: (A)

Solution

Partial roasting of chalcopyrite

CuFeS_{2}

in limited air produces copper(I) sulfide and iron(II) oxide:

2 CuFeS_{2} + O_{2} \to Cu_{2} S + 2 FeS + SO_{2}

2 Cu_{2} S + 3 O_{2} \to 2 Cu_{2} O + 2 SO_{2}

2 FeS + 3 O_{2} \to 2 FeO + 2 SO_{2}

The products after partial roasting are

Cu_{2} S

and

FeO

.

JEE Advanced · 2010 · 11 Apr 2010 · Paper 1 · Single correct option

Partial roasting of chalcopyrite produces

Accepted Answer

(A) $\mathrm{Cu}_{2} \mathrm{~S}$ and FeO

Answer

(B) $\mathrm{Cu}_{2} \mathrm{O}$ and FeO

Answer

(C) CuS and $\mathrm{Fe}_{2} \mathrm{O}_{3}$

Answer

(D) $\mathrm{Cu}_{2} \mathrm{O}$ and $\mathrm{Fe}_{2} \mathrm{O}_{3}$

JEE Advanced · 2010 · 11 Apr 2010 · Paper 1 · General Principles and Processes of Isolation of Metals

Solution

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