Heating mixture of $\mathrm{Cu}_{2}\mathrm{O}$ and $\mathrm{Cu}_{2}\mathrm{S}$ will give

(A) $\mathrm{Cu}+\mathrm{SO}_{2}$

(B) $\mathrm{Cu}+\mathrm{SO}_{3}$

(C) $\mathrm{CuO}+\mathrm{CuS}$

(D) $\mathrm{Cu}_{2}\mathrm{SO}_{3}$

JEE Main · 2005 · 08 May 2005 · Offline · General Principles and Processes of Isolation of Metals

Heating mixture of

Cu_{2} O

and

Cu_{2} S

will give

Answer: (A)

This is the self-reduction step at the heart of copper extraction. Once the ore has been part-roasted to a mixture of

Cu X_{2} O

and

Cu X_{2} S

, heating them together lets oxide and sulphide react with each other, the sulphide acting as the reducing agent, by

2 Cu X_{2} O + Cu X_{2} S 6 Cu + SO X_{2}

. The products are metallic copper and sulphur dioxide gas.

JEE Main · 2005 · 08 May 2005 · Offline · Single correct option