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(D) Electrolytic refining is a process used to purify metals that are obtained from their ores.Many metals like $Cu$,$Zn$,$Sn$,$Ni$,$Ag$,and $Au$ are

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$(i)$ and $(ii)$

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(D) Electrolytic refining is a process used to purify metals that are obtained from their ores.Many metals like $Cu$,$Zn$,$Sn$,$Ni$,$Ag$,and $Au$ are refined electrolytically.In this process,the impure metal is made the anode and a thin strip of pure metal is made the cathode.Highly reactive metals like $Na$,$K$,$Ca$,and $Mg$ are obtained by the electrolytic reduction of their molten chlorides or oxides,not by electrolytic refining of the impure metal.Therefore,among the given options,$Cu$ and $Au$ are refined by electrolytic refining.Thus,the correct pair is $(i)$ and $(ii)$.

Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?
$(i)$ $Au$
$(ii)$ $Cu$
$(iii)$ $Na$
$(iv)$ $K$

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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)$ $K$