The substance which conducts electricity by the movement of ions:
Correct answer: C. Molten NaCl
- A. Graphite
- B. Copper
- C. Molten NaCl
- D. Mercury
Explanation
Carbon atom has 4 electrons in its outer shell. This delocalised electron can move move freely between the carbon layers of graphite and conduct electricity. However, in the solid state, ionic compounds such as sodium chloride have their ions fixed in position and therefore these ions cannot move so solid ionic compounds cannot conduct electricity. However in the molten state, ions in ionic compounds are free to flow and therefore molten sodium chloride can conduct electricity.
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