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  • 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)

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)

Answers (1)

Ans. (a)
The method to be used for refining an impure metal depends on the nature of the metal as well as on the nature of impurities present in it.
Electrolytic refining is a process of refining a metal by the process of electrolysis.
Electrolytic refining is used for metals like Ag, Au, Cu, Zn, etc
Electrolytic refining of Cu: A large piece of impure copper is used as the anode with a thin strip of pure copper as the cathode. Copper(II) sulphate solution is the electrolyte.
Electrolytic refining of Au: A thin sheet of gold is made the cathode and a gold alloy is made the anode. Hydrochloric acid is used as an electrolyte.

Therefore option (A) is correct

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