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JAMB Physics 1991 Question 44

Question 44

Conduction through Liquids and Gases

The electrochemical equivalent of platinum is 5.0 × 10−7 kg C−1. To plate-out 1.0 kg of platinum, a current of 100 A must be passed through an appropriate vessel for

  1. A.5.6 hours
  2. B.56 hours
  3. C.1.4 × 104 hours
  4. D.2.0 × 104 hours.
Show the answer and explanation

Answer: A (5.6 hours)

Explanation

t = m/(zI) = 1.0/(5.0 × 10−7 × 100) = 20 000 s ≈ 5.6 hours.