Question

What type of substance can conduct electricity in the liquid phase but not in the solid phase?

Answer 1

Salts.

Explanation:

Salts when they are added to water can split into their corresponding ions which will serve as shuttles to electrons and therefore, the solution will be conductive.

For example, sodium chloride `NaCl` when added to water it will completely dissociate to give:

`NaCl(aq)->Na^(+)(aq)+Cl^(-)(aq)`

However, sodium chloride as at the solid state is a neutral compound and will not conduct electricity.

Note that, `NaCl` can conduct electricity at the molten state.