In electrochemistry, what is the name of the electrode where reduction occurs?

• A. Anode
• B. Cathode
• C. Base
• D. Electrolyte

Answer: (B)

In electrochemistry, the electrode where reduction occurs is called the cathode. This is fundamental to understanding the functions of electrodes in both galvanic (voltaic) cells and electrolytic cells.

At the cathode, reduction is defined as the gain of electrons by a species. During a redox reaction, the species that is being reduced accepts electrons, which results in a decrease in its oxidation state. This process is critical because it drives the desired reactions within the cell.

In galvanic cells, the cathode is the electrode where spontaneous reduction takes place, allowing the cell to generate electrical energy from the chemical reactions occurring in the anode and cathode. In electrolytic cells, the same principle applies but typically involves an external power source to drive the reduction reaction.

The anode, in contrast, is where oxidation takes place, meaning electrons are lost by the species, thus increasing its oxidation state. The terms base and electrolyte do not pertain to the role of electrodes in electrochemical processes; rather, a base is a substance that can accept protons or donate electron pairs, while an electrolyte refers to a substance that dissociates into ions in solution and can conduct electricity. Understanding these definitions and the roles of the an