Question

Crystalline sodium chloride is a bad conductor of electricity while molten $NaCl$ and its aqueous solution conduct electricity. This is because

• A. crystalline sodium chloride contains molecules only
• B. the ions present in it are not free to move in solid state
• C. sodium chloride is a covalent crystal
• D. solid substances do not conduct electricity

Answer 1

Answer: (A)

$N{a}^{+}$ and $C{l}^{-}$ ions are free to move only in molten state or aqueous solution.