Chemistry
NULL
Medium
Question
Which one of the following substances conducts electricity by the movement of ions ?
A
Graphite
B
Copper
C
Molten sodium chloride
✓ Official correct answer
D
Mercury
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A
Graphite
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B
Copper
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C
Molten sodium chloride
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D
Mercury
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Explanation
Molten sodium chloride conducts electricity through the movement of its free ions, unlike graphite, copper, and mercury, which conduct via delocalized or free electrons.
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