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JAMB Chemistry 1981 Question 7

Question 7

Redox Reactions

The oxidation state of manganese in KMnO4 is

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

Answer: D (+7)

Explanation

K is +1 and four O atoms give −8, so Mn + 1 − 8 = 0 and Mn = +7.