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

Options

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 substrances do not conduct electricity.

Answer

B

Explanation

`Na^(+) and Cl^(-)` ions are free to move only in molten state or aqueous solution.