Consider the following perhalate ions in acidic medium `ClO_(4)^(-)(I),BrO_(4)^(-)(II),IO_(4)^(-)(III)`
Arrange these in the decreasing order of oxidizing power

Options

A. `I gt II gt III`
B. `I gt III gt II`
C. `II gt I gt III`
D. `II gt III gt I`

Answer

D

Explanation

Standard reduction potential (in volts) of the perhalate ions are gives as below:
`ClO_(4)^(-)+2H^(-)+2e^(-) to ClO_(3)^(-)+H_(2)O, " "E^(0)=+1.19V`
`BrO_(4)^(-)+2H^(+)+2e^(-) to BrO_(3)^(-)+H_(2)O," "E^(0)=+1.72V`
`IO_(4)^(-)+2H^(+)+2e^(-) to IO_(3)^(-)+H_(2)O," "E^(0)=+1.65V`