1.

Reduction of the metal centre in aqueous permanganate ion involvesA. 3 electrons in neutral mediumB. 5 electrons in neutral mediumC. 3 electrons in weakly alkaline mediumD. 5 electrons in acidic medium

Answer» Correct Answer - A,C,D
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)


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