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  4. Sodium chloride has a crystalline structure made up of Na+ and Cl- ions. Why does NaCl not conduct electricity in solid state?

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Q. Sodium chloride has a crystalline structure made up of $Na^{+}$ and $Cl^{-}$ ions. Why does $NaCl$ not conduct electricity in solid state?

Chemical Bonding and Molecular Structure

Solution:

Due to electrostatic force of attraction, the ions do not move when electric current is applied in solid state. The ions become mobile when melted or dissolved in a polar solvent and conduct electricity.