Which of the following yields both metallic and non-metallic ions in solution?

The correct answer, which is salts, is based on their ability to dissociate in water to produce both metallic and non-metallic ions. Salts are typically the result of the neutralization reaction between an acid and a base. When dissolved in water, they separate into their constituent ions. For example, common table salt (sodium chloride) dissociates into sodium ions (a metallic ion) and chloride ions (a non-metallic ion). This property of salts to yield ions that include both types enhances their utility in various chemical reactions and biological processes.

In contrast, acids primarily yield hydrogen ions and non-metallic anions when dissolved. Bases yield hydroxide ions and metallic cations. Oils, often composed mainly of nonpolar organic compounds, do not produce ions when dissolved in water, focusing instead on non-ionic interactions and solubility dynamics. Hence, salts uniquely provide a mixture of both ionic types, making them the answer to the question.