Blister copper is.......

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(D) Blister copper is the product obtained after the Bessemerization process in the extraction of copper. It contains approximately $98\%$ pure copper

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Copper with $2\% $ impurity

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(D) Blister copper is the product obtained after the Bessemerization process in the extraction of copper. It contains approximately $98\%$ pure copper and $2\%$ impurities,which are primarily due to the evolution of $SO_2$ gas that creates blisters on the surface of the solidified copper. Therefore,it is referred to as copper with $2\%$ impurity.

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