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JAMB Chemistry 2000 Question 25

Question 25

Redox Reactions

MnO4−(aq) + 8H+(aq) + Y → Mn2+(aq) + 4H2O(l)
Y in the equation above represents

  1. A.2e−
  2. B.3e−
  3. C.5e−
  4. D.7e−
Show the answer and explanation

Answer: C (5e−)

Explanation

Manganese goes from +7 in MnO4− to +2, so it gains 5 electrons. (Charge check: −1 + 8 − 5 = +2.)