Reduction of oxidation state of central metal in aqueous permanganate ion involves (1) 5 electrons in neutral medium (2) 5 electrons in acidic medium (3) 3 electrons in neutral medium (4) 3 electrons in alkaline medium

Question

Reduction of oxidation state of central metal in aqueous permanganate ion involves (1) 5 electrons in neutral medium (2) 5 electrons in acidic medium (3) 3 electrons in neutral medium (4) 3 electrons in alkaline medium (A) 1,2 (B) 2,3 (C) 1,3 (D) 2,3,4

Tardigrade Admin · Accepted Answer

In acidic medium MnO4-+8H++5e- 1 arrow Mn2 ++4H2O In neutral medium MnO4-+2H2O+3e- arrow MnO2+4OH- Hence, number of electrons gained in acidic and neutral mediums are 5 and 3 electrons respectively.

Q. Reduction of oxidation state of central metal in aqueous permanganate ion involves
(1) 5 electrons in neutral medium
(2) 5 electrons in acidic medium
(3) 3 electrons in neutral medium
(4) 3 electrons in alkaline medium

$1, 2$

$2, 3$

$1, 3$

$2, 3, 4$

In acidic medium
$M n O_{4}^{-} + 8 H^{+} + 5 e^{- 1} \to M n^{2 +} + 4 H_{2} O$
In neutral medium
$M n O_{4}^{-} + 2 H_{2} O + 3 e^{-} \to M n O_{2} + 4 O H^{-}$
Hence, number of electrons gained in acidic and neutral mediums are 5 and 3 electrons respectively.

Q. Reduction of oxidation state of central metal in aqueous permanganate ion involves (1) 5 electrons in neutral medium (2) 5 electrons in acidic medium (3) 3 electrons in neutral medium (4) 3 electrons in alkaline medium

1,2

2,3

1,3

2,3,4