Which term describes a substance that forms ions when dissolved in water?

• A. Solvent
• B. Colloid
• C. Non-electrolyte
• D. Electrolyte

Answer: (D)

Verified step by step guidance

1. Understand the key terms: A solvent is the substance that dissolves a solute to form a solution, but it does not necessarily form ions.
2. A colloid is a mixture where small particles are dispersed throughout a solvent but do not dissolve to form ions.
3. A non-electrolyte is a substance that dissolves in water but does not produce ions, so it does not conduct electricity.
4. An electrolyte is a substance that, when dissolved in water, dissociates into ions and thus can conduct electricity.
5. Therefore, the term that describes a substance forming ions in water is 'electrolyte'.