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 :
Blister copper contain \[98%\] \[Cu\]and \[2%\]impurities. Blister \[Cu\] is heated in the presence of air in a reverberatory furnace. Molten metal is now stirred with green wood poles. The hydrocarbons liberated from green wood poles reduce \[C{{u}_{2}}O\] into \[Cu\]. Copper thus obtained is \[99.5%\] pure.
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