Electrolysis Practice Exam

In electrolysis, where should the inactive electrode be placed for direct current?

1. In the solution

2. On the skin

3. In a container

4. Disconnected

The correct answer is: On the skin

The inactive electrode in electrolysis is typically placed in a position where it can complete the circuit without actively participating in the electrochemical reactions occurring at the anode and cathode. Placing it on the skin allows the current to flow through the body, which can be critical in some electrolysis applications, particularly in the context of hair removal. When the inactive electrode is on the skin, it provides a direct pathway for the electric current to facilitate the treatment while minimizing the risk of unwanted reactions. This placement can also help ensure that the active electrode, often used for the deposition or removal of materials, achieves its function effectively. The other options suggest locations or situations where the inactive electrode would be less effective or not function as intended during the electrolysis process. For example, placing it in the solution or in a container may not allow for optimal skin contact or proper current distribution, while a disconnected electrode would negate the purpose of completing the circuit entirely. Thus, positioning the inactive electrode on the skin is the correct choice for achieving effective electrolysis with direct current.