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JAMB Chemistry 2006 Question 45

Question 45

Electrolysis

The solution that will conduct the highest amount of electricity is

  1. A.0.5 mol dm−3 of hydrochloric acid
  2. B.2.0 mol dm−3 of hydrochloric acid
  3. C.0.5 mol dm−3 of ethanoic acid
  4. D.2.0 mol dm−3 of ethanoic acid
Show the answer and explanation

Answer: B (2.0 mol dm−3 of hydrochloric acid)

Explanation

HCl is a strong acid (fully ionised) and the 2.0 mol dm−3 solution has the most ions, so it conducts best.