Multiple choice

Which of the following is the best conductor of electricity?

  1. Ordinary water

  2. Sea water

  3. Boiled water

  4. Distilled water
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sea water is the best conductor because it contains dissolved salts like sodium chloride which ionize and create free-moving charged particles. These ions carry electrical current much more effectively than pure water. Ordinary water has some dissolved ions but far fewer than sea water, while distilled and boiled water have almost no ions.

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