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JAMB Chemistry 1980 Question 30

Question 30

Redox Reactions

Which of the following does NOT happen when a zinc rod is introduced into a solution of copper (II) sulphate?

  1. A.Electrons flow towards the zinc rod
  2. B.The zinc rod dissolves
  3. C.The temperature of the soil changes
  4. D.The blue colour of the solution gradually disappears
  5. E.Copper metal is deposited
Show the answer and explanation

Answer: A (Electrons flow towards the zinc rod)

Explanation

Zinc atoms give up electrons to the Cu2+ ions, so electrons flow away from the zinc, not towards it. The zinc dissolves, copper is deposited, the blue colour fades and heat is given out.