Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?
(i) and (ii)
(i) and (iii)
(ii) and (iii)
(iii) and (iv)
In electrolytic refining, electric current is used to purify metals.
Metals like Cu, Ag, Zn, Au are refined by this method.
Na, K, and Ca cannot be refined using electrolysis because they are highly reactive. They are refined by electrolytic reduction instead.