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Question

Identify the following substance that is underlined: A Gas which does not conduct electricity in the liquid state but conducts electricity when dissolved in water.


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Solution

Conductivity: A substance conduct electricity due to the presence of free electrons in the valence shell or due to the presence of free ions in an aqueous solution.

  • A gas that does not conduct electricity in the liquid state but conducts electricity when dissolved in water is Hydrogen chloride gas.
  • HCl in its gas phase does not conduct electricity, when it is dissolved in water it makes a solution of hydrochloric acid and dissociates into ions which are free to move and conducts electricity.
  • The balanced chemical reaction of dissociation of hydrochloric acid can be represented as:

HCl(aq)HydrochloricacidH+(aq)Hydrogenion+Cl-(aq)Chlorideion

  • So, hydrogen chloride in a liquid state due to the presence of hydrogen and chloride ions.

Hence, Hydrogen chloride is a gas that does not conduct electricity in the liquid state but conducts electricity when dissolved in water.


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