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JAMB Chemistry 2001 Question 22

Question 22

Redox Reactions

In which of the following reactions does reduction take place?

  1. A.Fe2+ − e− → Fe3+
  2. B.2O2− → O2 + 4e−
  3. C.Cr − 2e− → Cr2+
  4. D.2H+ + 2e− → H2
Show the answer and explanation

Answer: D (2H+ + 2e− → H2)

Explanation

Reduction is gain of electrons. Only in D does a species (H+) gain electrons; the others all lose electrons.