Question 12
Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?

(i) $A u$
(ii) $C u$
(iii) $N a$
(iv) $K$

(a) (i) and (ii) (b) (i) and (iii)

(c) (ii) and (iii) (d) (iii) and (iv)

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Solution

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.

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Question 12
Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?

(i) $A u$
(ii) $C u$
(iii) $N a$
(iv) $K$

(a) (i) and (ii) (b) (i) and (iii)

Q. Which of the following metals are refined by electrolytic refining?

(i)

A u

(ii)

C u

(iii)

N a

(iv)

K

Outline the principles of refining of metals by the following methods:

(i) Zone refining

(ii) Electrolytic refining

(iii) Vapour phase refining

Q. Match the refining methods (Column I) with metals (Column II).

	Column I (Refining methods)		Column II (Metals)
(I)	Liquation	(a)	Zr
(II)	Zone Refining	(b)	Ni
(III)	Mond Process	(c)	Sn
(IV)	Van Arkel Method	(d)	Ga

Question 18
Which of the following metals are obtained by electrolysis of their chlorides in molten state?
(i) $Na$
(ii) $Ca$
(iii) $Fe$
(iv) $Cu$

(a) (i) and (iv)
(b) (iii) and (iv)
(c) (i) and (iii)
(d) (i) and (ii)

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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)

Question 12
Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?

(i) $A u$
(ii) $C u$
(iii) $N a$
(iv) $K$

(a) (i) and (ii) (b) (i) and (iii)

(c) (ii) and (iii) (d) (iii) and (iv)