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JAMB Physics 1979 Question 30

Question 30

Conduction through Liquids and Gases

In an electrolysis experiment, a cathode of mass 5 g is found to weigh 5.01 g after a current of 5 A flows for 50 seconds. What is the electrochemical equivalent of the deposited substance?

  1. A.0.00004 g/C
  2. B.0.00002 g/C
  3. C.0.02500 g/C
  4. D.0.05000 g/C
  5. E.0.00001 g/C.
Show the answer and explanation

Answer: A (0.00004 g/C)

Explanation

Mass deposited m = zIt. Here m = 0.01 g and It = 5 × 50 = 250 C, so z = 0.01/250 = 0.00004 g/C.