Molten sodium chloride conducts electricity due to the presence of

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answer is D.

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Detailed Solution

Molten sodium chloride conducts electricity due to the presence of free ions.
Free ions are the ions whose properties are not affected by atoms, ions or molecules. The flow of electricity in the chemical compound is due to the free electrons as well as free ions. If the solid is melted, the ions in the compound move and carry a charge. If it is not melted, electricity cannot flow.

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