Question

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solid NaCl is an insulator but molten NaCl is a good conductor of electricity

Answer 1

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NaCl (common salt) is solid in state and solid ions or compounds don't conduct electricity. It needs to be either melted, molten or dissolved in a solution (i.e. water) first. This is because the electrons in a solid state won't be free to move to either the Cathode (-ve) or to the Anode (+ve). In a liquid state the electrons are free enough to move.

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