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An electrode made from a member of the half-cell's own redox couple is called:
AA salt bridge
BA voltmeter probe
CAn active electrode
DAn inert electrode
Answer & Solution
Correct answer: C. An active electrode
1. Sometimes the electrode is just a conductor and sometimes it takes part in the chemistry.
2. An inert electrode is needed when neither member of the redox couple can reasonably function as an electrode.
3. Electrodes constructed from a member of the redox couple, such as a magnesium anode, are called active electrodes.
4. The electrode must be electrically conductive and in a phase separate from the half-cell solution.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 17 'Electrochemistry', sections 17.1-17.7_
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