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AIIMS 2003

Exam: AIIMS
Year: 2003
Subject: Chemistry
Chapter: General Principles and Processes of Isolation of Metals

AIIMS 2003 · Chemistry · General Principles and Processes of Isolation of Metals

In the extraction of copper from sulphide ore the metal is formed...

In the extraction of copper from sulphide ore the metal is formed by reduction of

\mathrm{Cu}_2 \mathrm{O}

with

Options

A $\mathrm{FeS}$
B $\mathrm{CO}$
C $\mathrm{Cu}_2 \mathrm{~S}$
D $\mathrm{SO}_2$ .

Correct answer

A. $\mathrm{FeS}$

Step-by-step solution

Iron has greater affinity for oxygen than copper.

\begin{gathered}\mathrm{Cu}_{2} \mathrm{O}+\mathrm{FeS} \rightarrow \mathrm{FeO}+\mathrm{Cu}_{2} \mathrm{ S}\\ \mathrm{FeO}+\mathrm{SiO}_{2} \rightarrow \mathrm{FeSiO}_{3} \\ (\mathrm{slag}) \end{gathered}

\begin{aligned}& 2 \mathrm{Cu}_{2} \mathrm{ S}+3 \mathrm{O}_{2} → 2 \mathrm{Cu}_{2} \mathrm{O}+2 \mathrm{SO}_{2} \\ & 2 \mathrm{Cu}_{2} \mathrm{O}+\mathrm{Cu}_{2} \mathrm{ S} \underset{\text{ auto }}{\text{ reduction }}6 \mathrm{Cu}+\mathrm{SO}_{2} . \end{aligned}

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