Question

Which of the following is not an example of roasting?

• A. $2ZnS + 3O_{2} \rightarrow 2ZnO + 2SO_{2}$
• B. $2PbS + 3O_{2} \rightarrow 2PbO + 2SO_{2}$
• C. $2Cu_{2}S + 3O_{2} \rightarrow 2Cu_{2}O + 2SO_{2}$
• D. $2Cu_{2}O + Cu_{2}S \rightarrow 6Cu^{+}SO_{2}$

Answer 1

Answer: (D)

$2Cu_{2}O + Cu_{2}S \rightarrow 6Cu^{+}SO_{2}$

Answer 2

It is an example of auto reducti9on in which unoxidised copper sulphide reduces copper oxide.