Question

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)

Answer 1

Option (a) is correct.
Electrolytic refining is the process to obtain pure metals by the process of electrolysis.
In this process, impure metal is made the anode and a thin strip of pure metal is made the cathode.
This process is widely used to refine impure metals such as Cu, Zn, Pb, Ni, Ag, and Au.