Equivalent mass of `KMnO_(4)` in acidic medium, concentrated alkaline medium and dilute basic medium respectively are M, M, M. Reduced products can be

Options

A. `MnO_(2), MnO_(4)^(-) , Mn^(2+)`
B. `MnO_(2), Mn^(2+), MnO_(4)^(2-)`
C. `Mn^(2+), MnO_(2), MnO_(4)^(2-)`
D. `Mn^(2+), MnO_(4)^(2-), MnO_(2)`

Answer

C

Explanation

`MnO_(4)^(-) + 8H^(+) + 5e^(-) to Mn^(2+) + 4H_(2)O`(acidic medium)
`MnO_(4)^(-) + 4H^(+) + 3e^(-) to MnO_(2) + 2H_(2)O`(concentrated basic medium)
`MnO_(4)^(-) + e^(-) to MnO_(4)^(2-)`(dilute basic medium)