Electrolytic refining is used to purify which of the following meta...

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Electrolytic refining is used to purify which of the following metals?
(i) \( \mathrm{Cu} \) and \( \mathrm{Zn} \)
\( \mathrm{P} \)
(ii) \( \mathrm{Ge} \) and \( \mathrm{Si} \)
(iii) \( \mathrm{Zr} \) and \( \mathrm{Ti} \)
W
(iv) \( \mathrm{Zn} \) and \( \mathrm{Hg} \)
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