Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?

Options

A. (i) and (ii)
B. (ii) and (iii)
C. (ii) and (iii)
D. (iii) and (iv)

Answer

A

Explanation

Sodium and potassium are extracted by electrolytic reduction. Metals obtained after electrolytic reduction are in pure form. But, copper and gold are in impure form after extraction. Copper and gold are refined by electrolytic refining methods.