JAMB Physics 2001 Question 37

Question 37

Conduction through Liquids and Gases

Which of the following graphs correctly represents the variation of mass of a given material deposited with time for constant current in Faraday's law of electrolysis?

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: C (Graph C)

Explanation

m = ZIt, so with constant current the mass is proportional to time: a straight line through the origin, which is graph C.