The substance that would likely to be the best conductor of electricity in the pure liquid state is: BaF2. This is because BaF2 is an ionic compound, hence it can conduct electricity really well in the molten state.
When the ionic compounds melt, they contain charged particles which are cations and anions. These cations and anions can move freely in the molten state so that they can conduct electricity really well. It also happens to the ionic compounds in the dissolved state. That is why BaF2 is a better conductor of electricity from the substances followed.
Learn more about the ionic compound here https://brainly.com/question/29421834
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