The Wohlwill process is an electrolytic process used to refine ____?

The Wohlwill process is an electrolytic process used to refine ____?
[A]Silver
[B]Copper
[C]Gold
[D]Iron

Gold
The Wohlwill process refers to an electrolytic process for refining gold using a hydrochloric-acid electrolyte. The process gives gold of 99.999% pure, and of higher purity than gold produced by the other common refining method.

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