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When do ionic compounds conduct electricity?

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When do ionic compounds conduct electricity?

(a) In gaseous state

(b) In solid state

(c) When dissolved in water

(d) They never conduct

This question was posed to me in an online quiz.

The question is from Classification of Solids topic in section Mechanical Properties of Solids of Engineering Physics I

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The correct choice is (c) When dissolved in water

For explanation: Ionic compounds can conduct electricity only if their ions are free to move. Hence they behave as conductors when they are dissolved in water.

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