Identify: A gas which does not conduct electricity in the liquid state but conducts electricity when dissolved in water.

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Solution

HCl gas in liquid state does not ionize hence it does not conduct electricity.

But HCl solution or aqueous HCl conducts electricity since HCl completely dissociates in solution to form hydronium H3O+ and Cl- ions and migration of these ions in opposite directions to each other allows electricity and thus becomes the conductor of electricity.

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