Which one of the following substances conduct electricity by the movement of ions?
Correct answer: C. Molten sodium chloride
- A. Graphite
- B. Copper
- C. Molten sodium chloride
- D. Mercury
Explanation
The correct answer is molten sodium chloride. When sodium chloride is in its molten state, it dissociates into sodium and chloride ions, which are free to move and conduct electricity. This is characteristic of electrolytes, which conduct electricity via ion movement. Graphite (A) and metals like Copper (B) and Mercury (D) conduct electricity through the movement of electrons, not ions, which is different from the mechanism in electrolytes.
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