Chemistry - Electrochemistry Question with Solution | TestHub

Solid sodium chloride is an ionic solid. In the solid state, the ions are held in fixed positions by strong electrostatic forces of attraction and are not free to move. Therefore, it does not conduct electricity.

Aqueous potassium chloride contains free mobile ions and conducts electricity.

Graphite has delocalized electrons in its structure, making it a good conductor of electricity.

Copper metal is a metallic solid and conducts electricity due to the presence of free valence electrons.

Answer: Solid sodium chloride