From the following list of substances, how many conduct electricity: HCl(aq), HCl(molten), AlCl3(molten), AlF3(molten), Graphite, Na(s), AlCl3(aq)?

Correct answer: 5

Solution

Electrical conduction requires free charge carriers. Ionic compounds in aqueous solution or in molten state conduct via ions. Graphite conducts via delocalised pi electrons. Metals conduct via free electrons.

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