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Faraday's first law of electrolysis states that the mass deposited is proportional to the

  • A.surface area of the electrode used
  • B.quantity of electricity passed
  • C.voltage applied across the cell
  • D.resistance of the electrolyte

Answer: B

Correct answer: quantity of electricity passed

The first law states \( m \propto Q = It \), so the mass liberated depends on the current and the time and on nothing else - not on the electrode area, the applied voltage or the concentration, provided the electrolysis proceeds. It follows directly from each ion requiring a fixed number of electrons to be discharged.

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