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Question

Molten sodium chloride conducts electricity due to the presence of:


A

free electrons

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B

free ions

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C

free molecules

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D

atoms of sodium

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Solution

The correct option is B

free ions


In the solid state, the sodium chloride molecules are bound together by strong inter-molecular forces of attraction.
In the molten state, the crystal lattice structure breaks down and ions are formed, which are mobile and conduct electricity.


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