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Indicate the principle behind the method...

Indicate the principle behind the method used for the refining of zinc.

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Electrolytic refining In this method, anode is made up of impure metal (Zn) and cathode is made up of the same pure metal (Zn). Anode and cathode are put in a suitable electrolytic solution of soluble salt of the same metal. The more basic metal remains in the solution and the less basic metal go to the anode mud.
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