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JAMB Chemistry 2023 Question 30

Question 30

Redox Reactions

Write out the increasing oxidation number of the transition metal ion for the compounds K2Cr2O7, V2O5 and KMnO4.

  1. A.K2Cr2O7 < KMnO4 < V2O5
  2. B.V2O5 < K2Cr2O7 < KMnO4
  3. C.KMnO4 < K2Cr2O7 < V2O5
  4. D.KMnO4 < V2O5 < K2Cr2O7
Show the answer and explanation

Answer: B (V2O5 < K2Cr2O7 < KMnO4)

Explanation

V in V2O5 is +5, Cr in K2Cr2O7 is +6 and Mn in KMnO4 is +7.