Discussion
Three of the following require an external supply of electrical energy. The exception is
Answer: C
Correct answer: a Daniell cell delivering current to a load
A Daniell cell is galvanic: its reaction is spontaneous and it supplies electrical energy rather than consuming it. The other three are electrolytic, forcing a non-spontaneous reaction with an external supply - anodising to build an oxide film, electroplating to deposit nickel, and electrorefining to dissolve impure copper at one electrode and deposit pure copper at the other.
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