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JAMB Physics 1998 Question 47

Question 47

Conduction through Liquids and Gases

The electrochemical equivalent of a metal is 1.3 × 10−7 kg C−1. The mass of the metal which 2.0 × 104 C of electricity will deposit from a suitable electrolyte is

  1. A.6.5 × 10−2 kg
  2. B.2.6 × 10−2 kg
  3. C.6.5 × 10−3 kg
  4. D.2.6 × 10−3 kg
Show the answer and explanation

Answer: D (2.6 × 10−3 kg)

Explanation

Faraday's first law: m = zQ = 1.3 × 10−7 × 2.0 × 104 = 2.6 × 10−3 kg.