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JAMB Chemistry 1981 Question 29

Question 29

Electrolysis

If 48,000 coulombs of electricity are required to discharge 0.5 mole of sodium from a molten sodium chloride mass, then the number of coulombs required to discharge 2 moles of lead from molten lead (II) chloride is

  1. A.48,000
  2. B.96,000
  3. C.192,000
  4. D.384,000
  5. E.576,000
Show the answer and explanation

Answer: D (384,000)

Explanation

Na+ needs 1 mol of electrons per mole, so 1 mol of electrons is 96,000 C here. Pb2+ needs 2 mol of electrons per mole, so 2 mol Pb needs 4 × 96,000 = 384,000 C.