Which of the following cannot be used as a test for `H_2O_2` ?

Options

A. `Ag_2O`
B. `Fe^(3+)`
C. Acidified `KMnO_4`
D. Acidified `K_2Cr_2O_7`

Answer

B

Explanation

The reduction potential of `Fe^(3+)// Fe^(2+)` is higher than the reduction potential of `O_2//H_2O_2` . So `H_2O_2` cannot reduce `Fe^(3+) ` to `Fe^(2+)`