Discussion
Which of the following sets comprises liquids which are poor conductors of electricity ?
Answer: C
The set of poor conductors is shampoo, vegetable oil, distilled water.
A liquid conducts electricity when it contains enough dissolved ions. Distilled water is almost free of dissolved salts, vegetable oil has no ions, and shampoo conducts only weakly; in the school tester activity none of them makes the bulb glow, so they are classed as poor conductors.
Each other set contains good conductors. Tap water carries dissolved salts. Salt solution, lemon juice and vinegar contain ions from salts and acids. Sugar solution does not conduct, but vinegar and lemon juice in the same set do.
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