In weak alkaline medium KMnO 4 converted in to-

KMnO4 Reduction in acidicmedium: MnO4( ) + 5e( )+ 8H+ ————— gt; Mn(2+) + 4H2O 2. KMnO4 Reduction In basic medium: MnO4( ) + e( ) ———— gt; MnO4(2 ) 3. KMn ...

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Standard XII

Chemistry

Potassium Permanganate

In weak alkal...

Question

In weak alkaline medium KMnO₄ converted in to?

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Solution

KMnO4 Reduction in acidicmedium:

MnO4(-) + 5e(-)+ 8H+ —————> Mn(2+) + 4H2O

2. KMnO4 Reduction In basic medium:

MnO4(-) + e(-) ————> MnO4(2-)

3. KMnO4 in Reduction in Neutral or Weakly Alkaline Medium:

MnO4- + 4 H+ + 3 e- ————> MnO2 + 2H2O

This Happens as oxidation character order for KMnO4 is Acidic > Neutral > Basic.

Reason for Oxidation character of KMnO4 -The acidic solution for this reaction consumes more H+ ions, implying that a lower pH favors this reaction.

Also Because in acidic medium, KMnO4 is much stronger oxidising agent than in neutral and basic medium. It is apparent from the fact that +7 state converts to +2 in acidic medium, +4 in neutral medium and +6 in basic medium.

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Similar questions

K M n O_{4}

acts as on oxidising agent in alkaline medium. When alkaline

K M n O_{4}

is treated with KI, iodide ion is oxidised to :

100

mL of

0.01 M

K M n O_{4}

oxidized

100

mL of

H_{2} O_{2}

in acidic medium. The volume of the same

K M n O_{4}

required in alkaline medium to oxidize

100

mL of the same

H_{2} O_{2}

will be :

(

M n O_{4}^{⊝}

changes to

M n^{2 +}

in acidic medium and to

M n O_{2}

in alkaline medium)

Q. In an alkaline medium,

K M n O_{4}

reacts as follows (At wt. of

K = 39.09

M n = 54.94

O = 16.0

2 K M n O_{4} + 2 K O H \to 2 K_{2} {M n O}_{4} + H_{2} O + [O]

i) The equivalent weight of

K M n O_{4}

in alkaline medium is 158.
ii) The number of electrons gained by one molecule of

K M n O_{4}

in the alkaline medium is 1.
iii) In the alkaline medium,

K M n O_{4}

acts as a reducing agent.

Select the correct option.

Q. How does

H_{2} O_{2}

reacts with

K M n O_{4}

in alkaline medium?

Q. In neutral or faintly alkaline medium, thiosulphate is quantitatively oxidized by

K M n O_{4}

to:

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In weak alkaline medium KMnO4 converted in to?

In weak alkaline medium KMnO₄ converted in to?