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Hydrogen chloride in the gaseous state conducts electricity very poorly, whereas its water solution conducts well. This is because

1. water itself is a good conductor of electricity
2. a gas cannot conduct electricity, but a liquid can
3. HCl gas does not follow Ohm's law, while its solution does
4. HCl dissociates into ions in aqueous solution

Correct answer: HCl dissociates into ions in aqueous solution

Solution

In aqueous solution, hydrogen chloride dissociates into hydrogen ions (H+) and chloride ions (Cl-), which are charged particles that facilitate the flow of electricity, unlike in its gaseous state where it remains as neutral molecules.

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