Question

Reduction of the metal centre in aqueous permanganate ion involves
A. `3 e^(-)` in neutral medium
B. `5 e^(-)` in neutral medium
C. `3 e^(-)` in alkaline medium
D. `5 e^(-)` in acidic medium

Answer 1

Correct Answer - A::D
In acidic medium
`MnO_(4)^(-) rarr Mn^(2+)`
(v.f = 5)
In neutral /basic medium
`MnO_(4)^(-) rarr MnO_(2)`
(v. f. = 3)
In strongly basic medium
`MnO_(4)^(-) rarr MnO_(4)^(2-)`
(v.f. = 1)