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JAMB Chemistry 2007 Question 17

Question 17

Redox Reactions

What happens when zinc rod is immersed in copper(II) tetraoxosulphate(VI) solution?

  1. A.The blue colour of the solution disappears.
  2. B.Electrons flow from copper to zinc.
  3. C.The zinc rod remains undissolved.
  4. D.The copper generates more copper ions.
Show the answer and explanation

Answer: A (The blue colour of the solution disappears.)

Explanation

Zinc displaces copper: Zn + Cu2+ → Zn2+ + Cu. As the blue Cu2+ ions are used up the solution loses its blue colour.