A) Copper
B) Iron
C) Silver
D) Magnesium
Correct Answer: A
Solution :
\[2C{{u}_{2}}S\,+3{{O}_{2}}\,\to 2C{{u}_{2}}O\,+2S{{O}_{2}};\] \[2C{{u}_{2}}O+\,C{{u}_{2}}S\to 6Cu\,+S{{O}_{2}}\].
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