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JAMB Chemistry 2014 Question 22

Question 22

Redox Reactions

Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)
In the reaction above, the oxidation number of the reducing agent changes from

  1. A.0 to +4.
  2. B.0 to +2.
  3. C.+1 to +2.
  4. D.+1 to +3.
Show the answer and explanation

Answer: B (0 to +2.)

Explanation

Zinc is the reducing agent: it goes from the element (0) to Zn2+ in ZnSO4 (+2).