A salt solution will conduct electricity, while a sugar solution will not. This is because salt is an ionic compound, meaning that it contains ions (charged atoms or molecules). When salt is dissolved in water, these ions are separated and can move freely in the solution. This movement of ions is what allows electricity to flow through the solution.

On the other hand, sugar is a covalent compound, meaning that it does not contain ions. When sugar is dissolved in water, it does not separate into ions and so cannot conduct electricity.