1180. Even minute presence of impurities in copper impairs its electrical conductivity seriously. Electrolytic refinning of blister copper is resorted to, when September 6, 2025 by Admin A. Cheap electricity is available B. The precious metal content of copper is high C. There is a demand for ultrapure (99.99%) electrolytic copper D. All of the above ✅ The correct answer is option D.