Reduction of the metal centre in aqueous permanganate ion involves

Options

A. 3 electrons in neutral medium
B. 5 electrons in neutral medium
C. 3 electrons in weakly alkaline medium
D. 5 electrons in acidic medium

Answer

A,C,D

Explanation

In acidic medium
`MnO_4^(-) +8H^(+)+5e^(-)toMn^(2+)+4H_2O`
(v.f.=5)
In neutral / faintly alkaline medium
`MnO_4^(-) +2H_2O+3e^(-)toMnO_(2)+4OH^-`
(v.f.=3)
In strongly alkaline medium
`MnO_4^(-) +e^(-)toMnO_(4)^(2-)`
(v.f.=1)