Which of the following is true of electrolytes?

• A. Electrolytes are always insoluble in water.
• B. Electrolytes cannot be found in biological systems.
• C. Electrolytes do not dissociate into ions in solution.
• D. Electrolytes conduct electricity when dissolved in water.

Answer: (D)

Verified step by step guidance

1. Understand the definition of electrolytes: Electrolytes are substances that, when dissolved in water, dissociate into ions and thus can conduct electricity.
2. Analyze the statement 'Electrolytes are always insoluble in water': This is false because electrolytes must dissolve in water to dissociate and conduct electricity.
3. Consider the statement 'Electrolytes cannot be found in biological systems': This is false since electrolytes like sodium, potassium, and chloride ions are essential in biological systems.
4. Evaluate the statement 'Electrolytes do not dissociate into ions in solution': This is false because the key property of electrolytes is their ability to dissociate into ions in aqueous solution.
5. Confirm that the correct statement is 'Electrolytes conduct electricity when dissolved in water' because the presence of free ions allows the solution to carry electric current.