Reduction occurs at which electrode?

• A. Cathode
• B. Anode
• C. Electrolyte
• D. Inert electrode

Answer: (A)

Reduction is the gain of electrons. It takes place at the cathode—the electrode where species in the electrolyte gain electrons. In an electrochemical cell, electrons flow from the anode to the cathode, so cations arriving at the cathode are reduced (for example, Cu2+ + 2e- → Cu). The anode is where oxidation occurs, releasing electrons. The electrolyte is the solution that contains ions, and an inert electrode is simply a conductor used in some reactions without itself being consumed. So the site of reduction is the cathode.