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Even minute presence of impurities in copper impairs its electrical conductivity seriously. Electrolytic refinning of blister copper is resorted to, when | |
A. | cheap electricity is available. [Wrong Answer] |
B. | the precious metal content of copper is high. [Wrong Answer] |
C. | there is a demand for ultrapure (99.99%) electrolytic copper. [Wrong Answer] |
D. | all (a), (b) & (c). [Correct Answer] |