Suggest a suitable material for the electrodes.

• A. Graphite, carbon, steel.
• B. Copper and tin.
• C. Plastic and glass.
• D. Wood and rubber.

Answer: (A)

Electrodes should be good conductors and chemically stable in the electrolyte, so they don’t participate in or alter the reaction.

Graphite (a form of carbon) fits this well: it conducts electricity and is relatively inert in many electrolytes, so it won’t easily react or dissolve. That makes it a common inert electrode material.

Metals like steel can conduct, but they tend to corrode or release ions into the solution, which can interfere with the process. Copper and tin are also conductive but can participate in redox chemistry themselves, changing the composition of the solution. Insulating materials such as plastic, glass, wood, and rubber won’t conduct electricity and thus aren’t suitable as electrodes.

So, the option that includes graphite (carbon) as an electrode material is the best choice because it provides a reliable, inert conducting surface.