In which of the following reactions does reduction takes place

In which of the following reactions does reduction takes place
  • A.
    Fe2+ – e– → Fe3+
  • B.
    2O2- →O2 + 4e–
  • C.
    Cr – 2e– → Cr2+
  • D.
    2H+ + 2e– → H2
Correct Answer: Option D
Explanation
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