A) to expel the dissolved gases in blister copper.
B) to bring the impurities to surface and oxidize them.
C) to increase the carbon content of copper.
D) to reduce the metallic oxide impurities with hydrocarbon gases liberated from the wood.
Correct Answer: D
Solution :
\[2C{{u}_{2}}S+3{{O}_{2}}\to 2C{{u}_{2}}O+2S{{O}_{2}}\] \[3C{{u}_{2}}O+\underset{\begin{smallmatrix} (From\,green \\ \log s\,of\,wood) \end{smallmatrix}}{\mathop{C{{H}_{4}}}}\,\to 6Cu+2{{H}_{2}}O+CO\]
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