Question

Why does sodium chloride not conduct electricity in solid state? Why does an aqueous solution of sodium chloride conduct electricity?

Answer 1

In order to conduct electricity a substance must have charge particles, such as electrons and ions, that are free to move freely through it. In the solid state, ionic compounds such as sodium chloride have their ions fixed in position and therefore these ions cannot move so solid ionic compounds cannot conduct electricity. However in the molten state, ions in ionic compounds are free to flow and therefore molten sodium chloride can conduct electricity.

Answer 2

Answer

aqueous solution of sodium chloride conduct electricity whereas it do  not conduct electricity in solid state because in solid state the ions are not free.  On the other hand in molten and and aqueous state it has free ions