KCET · Chemistry · General Principles and Processes of Isolation of Metals
Copper is extracted from Copper pyrites by heating in a Bessemer converter. The method is
based on the principle that
- A Copper has more affinity for oxygen than Sulphur at high temperature.
- B Iron has less affinity for oxygen than Sulphur at high temperature.
- C Copper has less affinity for oxygen than Sulphur at high temperature.
- D Sulphur has less affinity for oxygen at high temperature.
Answer & Solution
Correct Answer
(A) Copper has more affinity for oxygen than Sulphur at high temperature.
Step-by-step Solution
Detailed explanation
The reactions involved in the extraction of copper from coper pyrites is
\[
\begin{array}{l}
2 \mathrm{Cu}_{2} \mathrm{~S}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{Cu}_{2} \mathrm{O}+2 \mathrm{SO}_{2} \\
\mathrm{Cu}_{2} \mathrm{~S}+2 \mathrm{Cu}_{2} \mathrm{O} \rightarrow 6 \mathrm{Cu}+\mathrm{SO}_{2}
\end{array}
\]
Therefore, Cu has more affinity for oxygen than sulphur.
\[
\begin{array}{l}
2 \mathrm{Cu}_{2} \mathrm{~S}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{Cu}_{2} \mathrm{O}+2 \mathrm{SO}_{2} \\
\mathrm{Cu}_{2} \mathrm{~S}+2 \mathrm{Cu}_{2} \mathrm{O} \rightarrow 6 \mathrm{Cu}+\mathrm{SO}_{2}
\end{array}
\]
Therefore, Cu has more affinity for oxygen than sulphur.
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