Potassium permagnate works as oxidising agent both in acidic and … - Vidyadip

MCQ

Potassium permagnate works as oxidising agent both in acidic and basic medium. In both state product obtained by $KMn{O_4}$ is respestively

A
$MnO_2^ - $ and $M{n^{3 + }}$
B
$M{n^{3 + }}$ and $M{n^{2 + }}$
C
$M{n^{2 + }}$ and $M{n^{3 + }}$
✓
$Mn{O_2}$ and $M{n^{2 + }}$

✓

Answer

Correct option: D.

$Mn{O_2}$ and $M{n^{2 + }}$

d
(d)In alkaline medium, $KMn{O_4}$ first reduced in manganate and then in insolusle manganese dioxide.

$2MnO_4^ - + {H_2}O \to 2Mn{O_2} + 2O{H^ - } + 3[O]$

In acidic medium, Manganous sulphate formed

$MnO_4^ - + 8{H^ + } + 5{e^ - } \to M{n^{2 + }} + 4{H_2}O$.

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