What is considered an electrolyte?

An electrolyte is defined as a substance that conducts electricity when dissolved in a solvent or melted. In the context of this question, the correct choice identifies a liquid that is capable of carrying an electrical current. This is because, in its liquid state, an electrolyte contains ions that move freely, allowing electrical charges to flow.

For example, common electrolytes include solutions of salts, acids, or bases in water, which dissociate into ions and enable the conduction of electricity. The ability of liquids like water with dissolved salts to conduct electricity is fundamental in numerous applications, including battery technology and electrochemical processes.

The other options do not accurately capture the definition of an electrolyte. Solids can conduct electricity, but typically not to the extent that liquids can when considering electrolytic behavior. Gases also have limitations in conducting electricity, usually requiring specific conditions such as ionization. Non-conductive materials, by definition, do not carry an electrical current, which excludes them from being classified as electrolytes.