Answer the following questions briefly:
A metallurgical company needs high-purity copper for manufacturing electrical wires. The raw copper contains impurities, some of which dissolve during processing, while others remain insoluble. The company uses a method that ensures pure copper is obtained, and the insoluble impurities are collected separately.
i. The process of purification of the metal obtained after reduction is called
ii. Other than copper, which of the following metals can be refined electrolytically?