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JAMB Chemistry 1991 Question 21

Question 21

Electrolysis

A simple cell (figure above): a zinc plate and a copper plate dip into substance X, connected to a bulb. Which of the following substances could be satisfactorily used as X in the above figure?

Diagram for this question
  1. A.Ammonia and potassium hydroxide
  2. B.Potassium hydroxide and sodium chloride.
  3. C.Ammonia and ethanoic acid
  4. D.Ethanoic acid and sodium chloride.
Show the answer and explanation

Answer: B (Potassium hydroxide and sodium chloride.)

Explanation

X must be an electrolyte that conducts well. Potassium hydroxide and sodium chloride are both strong electrolytes; ammonia and ethanoic acid are only weak electrolytes.