Which among the following metals is refined by electrolytic method?
Metal which cannot be refined by electrolytic refining process is
Question 12 Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?
(i) Au (ii) Cu (iii) Na (iv) K
(a) (i) and (ii) (b) (i) and (iii)
(c) (ii) and (iii) (d) (iii) and (iv)