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What is a substance called if it contains free ions and conducts an electric current?
AAn insulator
BA precipitate
CA non-metal
DAn electrolyte
Answer & Solution
Correct answer: D. An electrolyte
1. A current needs charged particles that are free to move.
2. An electrolyte is a substance that contains free ions and behaves as an electrically conductive medium.
3. Sugar dissolved in water forms no ions, so it does not conduct and is a non-electrolyte.
_Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 18: Reactions in aqueous solution_