Manganate ion on electrolytic oxidation in alkaline medium gives permanganate ion.

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Q.
Given below are two statements:

Statement (I): Fusion of ${MnO}_{2}$ with KOH and an oxidising agent gives dark green $K_{2} {MnO}_{4}$ .

Statement (II): Manganate ion on electrolytic oxidation in alkaline medium gives permanganate ion.

In the light of the above statements, choose the correct answer from the options given below. [2024]

1 Statement I is true but Statement II is false

2 Both Statement I and Statement II are false

3 Statement I is false but Statement II is true

4 Both Statement I and Statement II are true

Ans.
(4)

Potassium permanganate is prepared by fusion of ${MnO}_{2}$ with an alkali metal hydroxide and an oxidising agent. This produces the dark green $K_{2} {MnO}_{4}$ which disproportionates in a neutral or acidic solution to give permanganate.

$2 {MnO}_{2} + 4 KOH + O_{2} \to 2 K_{2} {MnO}_{4} + 2 H_{2} O$

$3 {MnO}_{4}^{2 -} + 4 H^{+} \to 2 {MnO}_{4}^{-} + {MnO}_{2} + 2 H_{2} O$

Solution

1 Statement I is true but Statement II is false

2 Both Statement I and Statement II are false

3 Statement I is false but Statement II is true

4 Both Statement I and Statement II are true

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Solution

1 Statement I is true but Statement II is false

2 Both Statement I and Statement II are false

3 Statement I is false but Statement II is true

4 Both Statement I and Statement II are true

Ans. (4) Potassium permanganate is prepared by fusion of MnO2 with an alkali metal hydroxide and an oxidising agent. This produces the dark green K2MnO4 which disproportionates in a neutral or acidic solution to give permanganate. 2MnO2+4KOH+O2→2K2MnO4+2H2O 3MnO42-+4H+→2MnO4-+MnO2+2H2O

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