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JAMB Chemistry 2023 Question 20

Question 20

Electrolysis

Half cell reaction — Eθ
Cu2+(aq) + 2e− → Cu(s) +0.34V
Zn2+(aq) + 2e− → Zn(s) −0.76V
Fe2+(aq) + 2e− → Fe(s) −0.44V
Ba2+(aq) + 2e− → Ba(s) −2.90V
From the above data, it can be deduced that the most powerful reducing agent is?

  1. A.Fe
  2. B.Cu
  3. C.Zn
  4. D.Ba
Show the answer and explanation

Answer: D (Ba)

Explanation

The most negative electrode potential (−2.90 V for Ba) means the metal loses electrons most easily, so barium is the strongest reducing agent.