In the extraction of copper,when molten coppe | vedclass

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(B) During the extraction of copper,the final step involves the reduction of copper$(I)$ oxide $(Cu_2O)$ with copper$(I)$ sulphide $(Cu_2S)$ to produc

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Sulphur dioxide

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(B) During the extraction of copper,the final step involves the reduction of copper$(I)$ oxide $(Cu_2O)$ with copper$(I)$ sulphide $(Cu_2S)$ to produce metallic copper and sulphur dioxide gas $(SO_2)$: $2Cu_2O + Cu_2S \rightarrow 6Cu + SO_2 \uparrow$ When the molten copper is cooled,the dissolved $SO_2$ gas escapes,creating bubbles on the surface of the solidified metal,which gives it a blistered appearance. Hence,it is known as blister copper.

In the extraction of copper,when molten copper is cooled slowly,blister copper is obtained due to the evolution of which of the following gases?

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