(D) The process of refining blister copper using green logs of wood is known as $poling$. Green logs of wood release hydrocarbon gases (like $CH_4$) u

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To reduce the metallic oxide impurities with hydrocarbon gases liberated from the wood

(D) The process of refining blister copper using green logs of wood is known as $poling$. Green logs of wood release hydrocarbon gases (like $CH_4$) upon heating. These gases reduce the cuprous oxide $(Cu_2O)$ impurities present in the blister copper back to metallic copper $(Cu)$. The reaction is: $3Cu_2O + CH_4 \to 6Cu + 2H_2O + CO$.

Class 12 Chemistry General Principles and Processes of Isolation of Elements Refining of crude Metal

Difficult

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

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