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JAMB Chemistry 1988 Question 24

Question 24

Electrolysis

The mass of a substance, M, liberated at an electrode during electrolysis is proportional to the quantity of electricity, Q passing through the electrolyte. This is represented graphically by (see the graphs A–D in the figure)

Diagram for this question
  1. A.Graph A
  2. B.Graph B
  3. C.Graph C
  4. D.Graph D
Show the answer and explanation

Answer: A (Graph A)

Explanation

Direct proportion (Faraday's first law) gives a straight line through the origin: M = 0 when Q = 0. Graph A is the only such line.