Which of the following materials conducts electricity?

Crystalline potassium chloride

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Fused sulphur

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Molten sodium chloride

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Diamond

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Solution

The correct option is C Molten sodium chloride
In crystalline solids, the ions are tightly bound by strong coulombic force of attraction having greater interatomic interaction and less interparticle space. ${N a}^{+}$ and ${C l}^{-}$ ions are free to move only in molten state or aqueous solution. Hence, they show electrical conductivity in molten state.

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