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  4. In order to refine Blister copper it is melted in a furnace and is stirred with green logs of wood. The purpose is

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Q. In order to refine "Blister copper" it is melted in a furnace and is stirred with green logs of wood. The purpose is

Chhattisgarh PMTChhattisgarh PMT 2005

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 $C u$. Copper thus obtained is $99.5$ pure.