Question

Which of the following metals are obtained by electrolysis of their chlorides in molten state ? [NCERT Exemplar Problems]
(i) Na
(ii) Ca
(iii) Fe
(iv) Cu
(a) (i) and (iv)
(b) (iii) and (iv)
(c) (i) and (iii)
(d) (i) and (ii)

Answer 1

Answer:

(d)  (i) and (ii)

Explanation:

The correct option is (D).

Metals such as K, Na, Ca, Mg and Al, that are reactive or at the top of the electrochemical series, are extracted from the electrolysis of fused compounds.

In case of their aqueous solutions, metals cannot be extracted as the water in the solution gets discharged at the cathode and only electrolysis of fused compounds is possible. These fused compounds are generally chlorides.