The distinguishing characteristic of all electrolyte solutions is that they:

• A. form precipitates when mixed with acids
• B. contain only nonpolar molecules
• C. conduct electricity due to the presence of ions
• D. do not dissolve in water

Answer: (C)

Verified step by step guidance

1. Understand what an electrolyte solution is: it is a solution that contains ions, which are charged particles.
2. Recall that the presence of ions in a solution allows it to conduct electricity because ions can move and carry charge through the solution.
3. Evaluate the given options: forming precipitates when mixed with acids is not a defining characteristic of all electrolyte solutions, as this depends on the specific ions present.
4. Note that electrolyte solutions do not contain only nonpolar molecules; in fact, they contain charged ions, which are polar or ionic species.
5. Recognize that electrolyte solutions do dissolve in water, as water is a polar solvent that stabilizes ions, allowing them to dissociate and conduct electricity.