When an aqueous solution conducts electricity always there is-

no gas produced at one electrode

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a metal deposited at cathode

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hydrogen or oxygen gas produced

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evidence of a chemical change

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Solution

The correct option is D evidence of a chemical change
Chemical change occurs when aqueous solution conducts electricity. Ionic compounds (compounds which ionize in aqueous solution) conduct electricity when dissolved in water because they are dissociated into ions and carry charge through the solution.

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