2019 U.S. National Chemistry Olympiad Local Section Exam Question 10

Which methods would be suitable for determining the concentration of an aqueous solution of KMnO4?

I. Visible spectrophotometry (colorimetry)
II. Redox titration
(A) I only
(B) II only
(C) Both I and II
(D) Neither I nor II

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Test ID: 1873