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JAMB Chemistry 1985 Question 21

Question 21

Electrolysis

A correct electrochemical series can be obtained from K, Na, Ca, Al, Mg, Zn, Fe, Pb, H, Cu, Hg, Ag, Au by interchanging

  1. A.Al and Mg
  2. B.Zn and Fe
  3. C.Zn and Pb
  4. D.Pb and H
  5. E.Au and Hg.
Show the answer and explanation

Answer: A (Al and Mg)

Explanation

The correct order is K, Na, Ca, Mg, Al, Zn, Fe, Pb, H, Cu, Hg, Ag, Au. Magnesium is more reactive than aluminium, so they must be swapped.