Here are the answers to your questions based on the provided information:
Question 1: Which solution in the video demonstrated the properties of an ionic solution?
Response: The NaCl solution.
Question 2: If the light bulb does not light up, that means the solution
Response: The solution is most likely made up of a covalent substance.
Question 3: In order for conductivity to be measured, the ions have to be
Response: Freely moving (aqueous solution).
If you have any more questions or need further clarification, feel free to ask!